How Much Data Does a Business SIM Need? 20GB vs 50GB, Sized by Job Role (2026)

The gap between GleeSim's O2 20GB and O2 50GB business SIM is £2 a month. Most teams still get it wrong, because they give every worker the same plan.

This guide shows how much data a business SIM needs for each type of job. It takes five minutes. You will finish with a number for every person on your team.

GleeSim is a boutique telecom company based in Livingston, Scotland. We build bespoke connectivity for UK businesses, from one-van trades to corporate and enterprise fleets. See all business SIM-only plans.

How much data does a business SIM need?

Most staff who use a phone for email, maps, messaging and a few video calls need 5GB to 15GB a month, so a 20GB business SIM fits. Staff who share their phone's internet with a laptop need 30GB or more, so 50GB or unlimited fits. Machines such as trackers need under 1GB.

Think of data like water in a bottle. A small bottle is fine for a short walk. A long hike needs a bigger one. Buying the big bottle for everyone wastes money. Giving the small bottle to the hiker leaves them stuck.

What uses the most data at work?

These are planning estimates. Real use changes with app settings and video quality.

Two things eat data: video calls and hotspots. Everything else is small change.

A laptop is hungrier than a phone. It syncs cloud files, downloads updates and runs video at higher quality, all in the background.

20GB vs 50GB business SIM: which fits each job role?

The last two rows matter most. A phone SIM is the wrong tool for a site office or a machine. That is where businesses lose real money.

Ready to order? O2 20GB business SIM, £16 + VAT or O2 50GB business SIM, £18 + VAT.

The 16GB rule: when to move from 20GB to 50GB

Here is a simple rule any team can use.

If a worker uses more than 16GB for two months in a row, move them to 50GB.

16GB is 80% of a 20GB plan. Past that point, one busy week will run them dry. The step up costs £2 a month. A worker with no data in front of a customer costs far more.

Under 16GB every month? Stay on 20GB and keep the saving.

How to check your team's data use in 5 minutes

1. Open your last three mobile bills. Each line shows the data used.
2. Write down the highest month for each person. Plan for the busy month, not the quiet one.
3. Ask one question: "Do you use your phone as a hotspot for a laptop?" A yes usually means 50GB or more.
4. Sort people into three groups: under 16GB, 16GB to 40GB, and over 40GB.
5. Send the list to GleeSim. We match each group to a plan and quote the whole fleet in one go.

No bills to hand? Every phone shows it. On iPhone, look in Settings, then Mobile Data. On Android, look in Settings, then Network, then Data usage.

What do GleeSim's O2 20GB and 50GB plans include?

Both plans are for UK-registered businesses. O2 applies a yearly price rise each April. Check the live product page for current terms before you order.

Not sure O2 reaches your patch? GleeSim also supplies EE, Vodafone and Three plans, plus multi-network SIMs that work across several UK networks.

When a phone SIM is the wrong answer

Some jobs need a different kind of SIM. GleeSim supplies all of them, with or without hardware.

• Mobile broadband (MBB). A site cabin, pop-up shop or temporary office needs a 5G router and an unlimited data SIM. See site cellular WiFi.
• IoT and M2M SIMs. Trackers, EV chargers, alarms and sensors send tiny amounts of data. An IoT SIM starts from £2.50 + VAT a month.
• Fixed IP SIMs. CCTV, payment terminals and remote access need an address that never changes. See fixed IP SIMs.
• Phones and tablets on contract. Need the handset too? See business phones from Apple and Samsung.

A plumber with three vans might need three 20GB phone SIMs, three tracker SIMs and one router SIM for the yard. That is one supplier and one bill.

Why UK businesses choose GleeSim?

• Based in Scotland. Our office is in Livingston, West Lothian. You speak to a person, not a phone menu.
• Telecom specialists. The GleeSim family started in 2009, and the team has 30 years of combined telecom experience.
• Bespoke, not boxed. We mix networks, allowances and hardware to fit your team, for SMEs, corporate and enterprise.
• One partner for everything. Business mobile contracts, MBB, IoT, M2M and fixed IP under one roof.

Buying 10 lines or more? Ask for a bespoke quote or call +44 208 5182329, Monday to Friday, 9am to 5pm.

Frequently asked questions

Is 20GB enough for a business SIM?

Yes, for most phone-only workers. Email, maps, messaging, CRM apps and a few video calls usually total 5GB to 15GB a month. 20GB stops being enough when the phone is used as a laptop hotspot or for daily video meetings.

Is 50GB worth the extra money over 20GB?

It is worth it for anyone who uses more than 16GB a month. On GleeSim's O2 plans the difference is £2 a month per line. For lighter users, that £2 buys data they will never use.

Should every employee be on the same data plan?

No. Sort staff by how they work. Office staff and most field staff fit 20GB. Hotspot users and heavy video users fit 50GB or unlimited. GleeSim can put different allowances on one account.

How much data does a mobile hotspot use?

A laptop on a phone hotspot uses roughly 1GB to 4GB in a working day, depending on video calls and file syncing. Used three days a week, that can pass 20GB in a month.

Can I mix phone SIMs, router SIMs and IoT SIMs with one supplier?

Yes. GleeSim supplies business mobile, mobile broadband, IoT, M2M and fixed IP SIMs, with or without hardware. Larger fleets get a bespoke quote.

Does GleeSim only serve Scotland?

No. GleeSim is based in Livingston, Scotland, and supplies businesses across the whole UK.

The Short Answer:

Give 20GB to phone-only workers. Give 50GB to anyone past 16GB a month. Give routers and machines their own type of SIM.

Size each line once and you stop paying for data nobody uses.

Order your O2 business SIM today, or send us your team list and GleeSim will size every line for you.

Compare every network and price in our pillar guide: Business SIM-only deals on UK networks.