The world's largest annual pilgrimage brings 20+ million people to a single city. Here is what happens to mobile networks — and what every pilgrim needs to know before they arrive.

Published by GleeSim  |  Iraq eSIM & Pilgrim Connectivity Specialists

Every year, on the 20th of Safar in the Islamic lunar calendar, something extraordinary happens. Karbala — a city of roughly two million residents — absorbs a human wave of more than 20 million pilgrims. The Arbaeen pilgrimage, marking the 40th day after the martyrdom of Imam Hussein, is not merely one of the world's largest religious gatherings. It is, by any credible measure, the

largest annual peaceful human gathering on Earth — surpassing even the Hindu Kumbh Mela and dwarfing the Hajj in raw attendance figures.

Pilgrims arrive from Iran, India, Pakistan, Lebanon, Azerbaijan, Nigeria, the United Kingdom, the United States, and dozens of other countries. They walk the 80-kilometre route between Najaf and Karbala on foot, sleep under open skies, eat from volunteer kitchens called Mowkebs, and share in a profound spiritual communion. And almost all of them carry smartphones.

What happens to mobile networks when 20 million devices converge on a single corridor? And what can you, as a pilgrim, do to protect your connectivity — and your safety — when the towers are overwhelmed? This guide answers both questions with the depth and honesty you deserve.

Part One: Understanding Ashura and Arbaeen — The Spiritual Context

The Battle of Karbala (680 CE) and Its Enduring Significance

On the 10th of Muharram, 61 AH (October 10, 680 CE), Imam Hussein ibn Ali, grandson of the Prophet Muhammad and the third Imam in Shia Islam, was killed at the Battle of Karbala. He had refused to pledge allegiance to Yazid ibn Muawiya, the Umayyad caliph — an act of principled resistance that cost him his life and the lives of most of his companions and male relatives. The women and children of his camp were taken prisoner and marched to Damascus.

In Shia Islam, Karbala does not represent defeat. It symbolises the eternal struggle between justice and tyranny, between conscience and coercion. The events of that day crystallised Shia identity and continue to shape the spiritual lives of hundreds of millions of Muslims worldwide.

Ashura — observed on the 10th of Muharram — is the day of mourning. Arbaeen — forty days later, on the 20th of Safar — marks the end of the mourning period and the return of Imam Hussein's surviving family members to Karbala.

The Scale of Arbaeen: Numbers That Defy Comprehension

The Arbaeen pilgrimage was banned under Saddam Hussein's government but returned rapidly after 2003. From approximately two million participants in 2003, attendance grew to:

•       11.2 million in 2016

•       15.3 million in 2018

•       16.3 million in 2021

•       21.6 million in 2022

•       22 million in 2023

•       22.1 million in 2024

•       More than 22 million again in 2025, with over 277 million phone calls recorded during the event window alone

 

Key Fact: The Numbers Behind the Calls During the 2025 Arbaeen pilgrimage (Safar 1–20, 1447 AH), Iraq's Communications and Media Commission recorded more than 277 million phone calls, including 272 million domestic and 4.4 million international calls, plus 47 million text messages. This is the communications pressure that every pilgrim walks into.

 

The Walk: 80 Kilometres of Faith

The defining act of Arbaeen is the foot march from Najaf to Karbala — approximately 80 kilometres undertaken over several days. Pilgrims walk through extreme heat (temperatures frequently exceed 40°C), receive free food, water, and shelter from Mowkebs operated by volunteers, and arrive at the Shrine of Imam Hussein for prayers and remembrance.

This is not a tourist trek. It is a pilgrimage of grief and devotion, undertaken in dense crowds, along routes with limited infrastructure, and under the weight of profound emotional and spiritual engagement. Safe navigation, group coordination, and communication with family abroad are not luxuries. They are necessities.

Part Two: Why Internet Access Fails During Arbaeen — A Technical Explanation

The Fundamental Problem: Too Many Devices, Too Few Towers

Mobile networks are designed to serve the expected population density of a given area. Karbala's telecom infrastructure is built for a city of roughly two million. During Arbaeen, the same towers must serve ten times that population. The physics of wireless communication make this mathematically impossible without significant intervention.

Each cell tower — whether 4G LTE or 5G — has a finite number of simultaneous connections it can support. This is called spectral capacity. When that ceiling is breached, new connection requests are rejected. Existing connections degrade. Data speeds plummet. Calls fail mid-sentence. Maps stop updating. WhatsApp messages queue unsent.

The Three Phases of Network Collapse at Arbaeen

Phase 1 — Approach Congestion (Days 1–3 before Arbaeen)

As millions of pilgrims converge on the Najaf-Karbala corridor, the first bottleneck is at border crossings and entry routes. In 2024, over 3.4 million foreign pilgrims entered Iraq for Arbaeen. The concentration of international SIM cards attempting to roam onto Iraqi networks creates immediate strain.

Phase 2 — Peak Congestion (1–2 days before and on Arbaeen itself)

The shrine precinct and the final kilometres of the walk route experience the most severe congestion. 20+ million devices in a geographic area of roughly 50 square kilometres is a network catastrophe. Even with temporary infrastructure upgrades, the ratio of users to capacity makes reliable connectivity impossible for most pilgrims using standard SIM plans.

Phase 3 — Dispersal Congestion (24–48 hours after Arbaeen)

As pilgrims begin leaving, the congestion shifts to transport hubs, border crossings, airports, and bus terminals. This is when many pilgrims lose the connectivity needed to book transport, confirm pickups, or navigate back to their accommodation.

Why International Roaming Fails Hardest

International roaming adds another layer of failure. When your home carrier's SIM roams in Iraq, your device must negotiate with a foreign network through inter-carrier agreements. During peak congestion, Iraqi carriers prioritise locally-registered SIM cards over roaming connections. Your roaming SIM is, by technical design, a lower priority connection.

The result: pilgrims carrying their UK, US, Pakistani, Iranian, or Malaysian SIM cards experience the worst connectivity — and pay premium roaming rates for the privilege of losing it.

Government Infrastructure Response

Iraq's Communications and Media Commission (CMC) has invested significantly in Arbaeen infrastructure in recent years. The CMC deploys temporary base stations, operates a central command room from Karbala, and coordinates with the three major Iraqi carriers — Asiacell, Zain Iraq, and Korek — to maximise capacity during the pilgrimage window.

For the 2025 Arbaeen, the CMC confirmed that "all technical and logistical work related to mobile network infrastructure has been finalized" and that preparations were in place to support "millions of pilgrims and journalists." These efforts genuinely help. But 22 million users is a number no infrastructure investment can fully accommodate in a two-week window.

Infrastructure Reality Check Even the most aggressive temporary network deployment cannot match the spectral demand of 22 million devices. What infrastructure investment does achieve is reducing catastrophic failure to manageable degradation — which means the difference between zero connectivity and slow, intermittent connectivity. This is why your SIM card choice matters enormously.

Part Three: The Iraq Telecom Landscape — What Every Pilgrim Needs to Know

Iraq's Three Major Networks

Carrier	Coverage Strength	4G Availability	Pilgrim Priority
Asiacell	Nationwide, strongest in south	Yes, including Karbala & Najaf	High — GleeSim partner
Zain Iraq	Nationwide, strong urban	Yes, good in holy cities	High — GleeSim partner
Korek	North and central Iraq	Yes, limited in south	Moderate

 

Why Local Network Access Changes Everything

During Arbaeen, the difference between having a locally-registered Iraqi SIM (or eSIM connected to a local carrier) versus a roaming foreign SIM is the difference between slow internet and no internet. Iraqi carriers apply Quality of Service (QoS) policies that maintain locally-registered connections at higher priority levels than roaming traffic. This is not discrimination — it is standard international telecommunications practice.

An eSIM that connects directly to Asiacell or Zain Iraq's infrastructure as a local data subscription receives the same priority treatment as any locally-registered Iraqi phone. This is the core technical reason why eSIMs designed specifically for Iraq — and for Arbaeen — outperform standard international roaming during the pilgrimage.

Part Four: What Losing Internet Access Actually Means for Pilgrims

Safety Risks

The Arbaeen walk covers 80 kilometres of route through southern Iraq. The crowd density, summer heat, and physical demands create real safety risks. Losing connectivity means:

•       No group coordination: Your caravan leader, your family members, your coach driver — all unreachable.

•       No emergency services: Difficulty reaching medical volunteers or safety personnel in a crowd of millions.

•       No navigation: Offline maps are essential when live GPS updates fail.

•       No family contact: For pilgrims of all ages, the inability to confirm your wellbeing to anxious family abroad causes immense stress.

Logistical Disruption

Beyond safety, connectivity failures disrupt the practical logistics of pilgrimage:

•       Booking return transport from Karbala during dispersal requires internet access

•       Accommodation check-ins and confirmations rely on messaging apps

•       Currency exchange apps, banking, and payment platforms need data

•       Prayer times, Ziyara guides, and Quran apps — downloaded or cloud-based — require connectivity for optimal use

Emotional and Spiritual Impact

Perhaps less discussed but deeply significant: millions of pilgrims want to share their Arbaeen experience with family members who cannot attend. Video calls, live-streamed moments at the shrine, and WhatsApp voice notes to parents and children back home are not trivial uses of bandwidth. For many pilgrims, these moments of digital connection form part of the spiritual experience itself.

Part Five: The Pilgrim's Complete Connectivity Strategy

Before You Travel: The Essential Preparation Checklist

1. Confirm your device is eSIM-compatible

eSIM-compatible devices include the iPhone XS and newer, Google Pixel 3 and newer, and Samsung Galaxy S20 series and newer. Check your device's settings under Network or Mobile Data for an "Add eSIM" or "Add Cellular Plan" option.

2. Ensure your phone is network-unlocked

Your device must be completely unlocked from your home carrier to use a local data SIM or eSIM in Iraq. Contact your carrier to confirm unlock status before departure.

3. Choose the right Iraq eSIM plan for your pilgrimage

GleeSim offers purpose-built Iraq eSIM plans designed specifically for the Arbaeen and Ziyara pilgrimages, connecting directly to Asiacell and Zain Iraq. You can view the full range of Iraq plans at gleesim.com/eSim-iraq or access the direct offer at offers.gleesim.com/offer-detail/202232/esim.

4. Install your eSIM before departure — on your home Wi-Fi

This is perhaps the single most important practical step. Installing an eSIM requires a stable internet connection. At Karbala during Arbaeen, this is precisely what you will not have. Install before you board your flight. The plan's data timer only begins when your eSIM connects to an Iraqi network — you will not waste a single day of your plan during transit.

5. Download essential apps in offline mode

Before you leave, download:

•       Google Maps or Maps.me — download the Iraq offline map package

•       Quran and prayer time apps with offline content saved

•       Ziyara guide apps with pre-cached content

•       Your caravan's WhatsApp group — ensure all contact info is saved

•       Your accommodation addresses and emergency contacts in screenshots

6. Charge a portable power bank to full capacity

Extended walking in heat drains batteries faster. A 20,000 mAh power bank can recharge a smartphone three to four times. Consider a solar-compatible model for the open-air sections of the walk.

During the Walk: Connectivity Management

Conserve data during peak congestion periods

When you are deepest in the crowd — especially on the final day approaching Karbala's shrines — data speeds will be at their lowest. This is the time to switch to offline maps, previously-downloaded prayers, and cached content. Reserve your data budget for communications that cannot wait.

Use WhatsApp voice notes over calls

During congested periods, voice notes transfer over lower bandwidth than live calls. If a call fails, send a voice note. The message will transmit when a momentary burst of bandwidth is available, which happens even in heavy congestion.

Establish a group check-in protocol

Agree with your group before the walk on fixed check-in times (e.g., every four hours) and a fixed message format so that even a brief connectivity window is enough to confirm everyone's safety status.

Use your eSIM's network flexibility

GleeSim's Iraq eSIM connects to the best available network (Asiacell, Zain, or Korek) based on signal strength at your location. This automatic network selection is particularly valuable in the varying terrain between Najaf and Karbala, where different carriers have different coverage strengths at different points on the route.

At the Shrine: Making the Most of Limited Bandwidth

The shrine precinct has the highest crowd density and the most severe network congestion. A few practical strategies:

•       Pre-schedule your video calls with family for the hours immediately after departing the shrine area, where congestion reduces

•       Take photos and videos during your visit and send them in batches when you reach a less congested area

•       Use the shrine's internal Wi-Fi networks where available for essential communications

•       The app WhatsApp performs better under congestion than standard cellular calls — use it as your primary communication channel

Part Six: GleeSim Iraq eSIM — Built for the Arbaeen Pilgrimage

Why Standard Travel SIMs Fail at Arbaeen

Most travel eSIM providers offer Iraq coverage as a generic international data product. These plans roam onto Iraqi networks through inter-carrier agreements, meaning they carry the same technical disadvantage as any other foreign SIM during the pilgrimage — lower network priority, higher susceptibility to congestion, and no specific optimisation for the holy cities.

What Makes GleeSim's Iraq Plans Different

GleeSim has built its Iraq eSIM offering around the specific requirements of pilgrims — not generic tourists. The key differentiators are:

•       Direct network partnerships: GleeSim holds direct relationships with Asiacell and Zain Iraq, the two carriers with the strongest infrastructure investments in Karbala and Najaf during pilgrimage seasons.

•       Pilgrim-optimised plans: Specific Ziyara and Arbaeen bundles are calibrated for the duration, data requirements, and connectivity challenges of the pilgrimage.

•       Data-only architecture: GleeSim plans are data-only, meaning you use WhatsApp, FaceTime, Telegram, and Messenger for all voice and video communication — apps that are significantly more resilient under congestion than traditional cellular calls.

•       WhatsApp-based management: As the world's first travel eSIM with WhatsApp integration, GleeSim lets you manage your plan, receive data usage alerts, and access support entirely through WhatsApp — no app download required.

•       No hidden fees: Zero roaming shocks, zero additional charges. Flexible packages from a free 1GB trial line to robust 20GB packages.

•       Pre-departure installation: Install before your flight and activate automatically on arrival in Iraq. The timer starts only when you land.

The GleeSim Iraq Plan Range

Plan	Data	Duration	Best For
Free Trial Line	1 GB	Flexible	Testing the connection before upgrading
Najaf-Karbala Ziyara Bundle	5 GB	14 days	Two-week holy city pilgrimage
Arbaeen Extended Plan	High-volume data	30 days	Full Arbaeen walk and shrine visits
General Iraq Plans (up to 20 GB)	Up to 20 GB	Flexible	Extended stays or high-usage pilgrims

 

Browse and activate your Iraq eSIM at: gleesim.com/eSim-iraq

Direct offer access: offers.gleesim.com/offer-detail/202232/esim

Part Seven: Frequently Asked Questions

Do I need a local Iraq SIM or will international roaming work?

International roaming will provide some connectivity but will perform significantly worse during Arbaeen due to network priority protocols. A locally-connected eSIM — especially one with direct partnerships to Asiacell or Zain Iraq, like GleeSim's plans — will provide substantially better connectivity during the pilgrimage.

Can I keep my home SIM active while using a GleeSim Iraq eSIM?

Yes. eSIM technology allows your physical home SIM and the Iraq eSIM to coexist in the same device simultaneously. You can receive calls and messages on your home number while your Iraq eSIM handles all data activity. You do not need to remove your home SIM card.

What if I need more data mid-pilgrimage?

GleeSim allows top-ups and bundle upgrades directly through the gleesim.com website without changing your eSIM. This can be managed by a family member back home if needed — a useful feature when connectivity is limited during the pilgrimage itself.

Is the GleeSim Iraq eSIM suitable for elderly pilgrims?

Yes. GleeSim's eSIM can be fully installed and configured before departure by a family member, requiring no technical interaction on arrival in Iraq. Once set up, it connects automatically, requires no SIM card management, and provides reliable connectivity without any airport paperwork or registration queues.

Will the eSIM work in Najaf as well as Karbala?

Yes. Asiacell and Zain Iraq — GleeSim's partner networks — provide coverage across Najaf, Karbala, and the full 80-kilometre Najaf-to-Karbala walk route. Coverage quality varies at different points on the route, but the eSIM automatically connects to whichever carrier provides the strongest signal at your location.

When exactly should I install the eSIM?

Install your GleeSim eSIM at home, on your own Wi-Fi, at least 24–48 hours before your flight. Do not install at an airport or in transit. The plan does not begin counting down until your device connects to an Iraqi network, so there is no cost to installing well in advance.

Will GleeSim's eSIM work for both Ashura and Arbaeen?

Yes. The eSIM provides continuous data access throughout the Muharram mourning period, covering both Ashura (10th Muharram) and Arbaeen (20th Safar), as well as all Ziyara activities in between.

What do I do if I lose connectivity completely?

If your connection drops completely:

•       Switch airplane mode on and off to force a network re-registration

•       Toggle between your home SIM and GleeSim eSIM in your phone's mobile data settings

•       Move to a less densely crowded area — even 100 metres of distance can make a significant difference

•       Wait for an off-peak window (late night typically sees reduced congestion around the shrines)

•       Use any available Wi-Fi at Mowkebs, hotels, or service stations along the route

Part Eight: A Broader Note on Digital Connectivity and Pilgrimage

There is a recurring debate within pilgrimage communities about whether smartphones belong at Arbaeen, Hajj, or other major gatherings. It is a genuine and respectful conversation. However, the practical reality of 2025 and beyond is that 20+ million people arrive at Arbaeen carrying smartphones, and those devices are tools of safety, family connection, and navigation — not merely distractions.

The question is not whether pilgrims will use their phones. They will. The question is whether they will be prepared with the infrastructure that lets those phones work reliably when it matters most.

A pilgrim who loses connectivity in the crowd and cannot reach their group is not more spiritually present. They are stressed, disoriented, and potentially unsafe. Preparation is not the enemy of devotion. It is what allows devotion to flourish.

Conclusion: Connectivity Is Not a Luxury at Arbaeen — It Is a Safety Requirement

Arbaeen is the world's largest annual pilgrimage. It brings together 20+ million people in one of the most logistically complex human gatherings on earth. The networks that serve those 20 million people are under extraordinary pressure — and the pilgrims who are least prepared for that pressure are the ones who will suffer most when connectivity fails.

The solution is not complicated. Install a purpose-built Iraq eSIM — one that connects directly to Asiacell and Zain Iraq, the carriers that serve Karbala and Najaf — before you board your flight. Download your offline maps. Agree on a group check-in protocol. Charge your power bank. And walk to Karbala knowing that your lifeline to your group, your family, and emergency services is ready when you need it.

GleeSim's Iraq eSIM plans were designed specifically for pilgrims making exactly this journey. Explore the full range and activate your plan at gleesim.com/eSim-iraq, or access the direct pilgrim offer at offers.gleesim.com/offer-detail/202232/esim.

May your pilgrimage be accepted, your path be safe, and your connection — to those you love and to the Divine — remain unbroken.

Quick Reference: Pilgrim Connectivity Checklist

Before Departure

•       Confirm device is eSIM-compatible and network-unlocked

•       Purchase and install GleeSim Iraq eSIM on home Wi-Fi

•       Download offline Iraq maps (Google Maps or Maps.me)

•       Download Quran, prayer time, and Ziyara apps with offline content

•       Save all emergency contacts as screenshots

•       Charge and pack a 20,000 mAh power bank

During the Pilgrimage

•       Use WhatsApp voice notes instead of calls during peak congestion

•       Switch to offline maps when data speeds degrade

•       Establish group check-in times every four hours

•       Move away from the densest crowd areas before making calls

•       Monitor your GleeSim data balance via WhatsApp alerts

GleeSim Iraq eSIM Links

Iraq eSIM Plans: gleesim.com/eSim-iraq

Direct Offer: offers.gleesim.com/offer-detail/202232/esim

GleeSim — The World’s First Travel eSIM with WhatsApp Integration

gleesim.com | Pilgrim Connectivity Specialists