This guide answers the most common data-related questions, including how much data you might need, how to track your usage, and what to do if you experience problems with data, roaming or tethering.

What is mobile data?

When you’re not connected to Wi-Fi, your device uses mobile data to access the internet for browsing, apps, messages and calls (where supported).

All mobile plans include a data allowance, usually measured in gigabytes (GB), or in some cases, unlimited data. If you’re on an unlimited tariff, check our Fair Usage Policy for details on usage at home and abroad.

How much data do I need?

Here’s a rough guide to typical data use (based on streaming at 720p):

These are estimates only. Your actual usage may vary depending on your apps, settings and quality of streaming.

How to track your data usage

You can easily check your usage in my.plan:

• Essential users: see overall usage by category.
• Gold users: view usage breakdowns (e.g. social media, streaming).
• Platinum users: get detailed insights by specific apps and services.

Common data issues and fixes

1. Check your device settings

• Make sure mobile data is switched on in your settings.
• Restart your device.
• Move to an area with better coverage.
• If you’re on the O2 network, check your APN settings.

2. Roaming abroad

When roaming:

• Data access may be limited by the local network.
• Missed calls or texts may be caused by poor signal or incorrect settings.

Try:

• Restarting your device.
• Checking your roaming and network settings.

For more detail, see our Roaming guide.

3. Account and allowance status

Data access may stop if:

• Your bill is unpaid.
• You’ve exceeded your allowance.
• You’ve reached a spend limit.

To check, log in to my.plan and go to Usage > Data.

4. If you’ve run out of data

You have two options:

• Purchase more data: Add a Data Boost via my.plan.
• Manage your usage: Turn off Wi-Fi assist, background app refresh, and auto-updates to stretch your allowance.

⚠️ If you exceed your allowance without a spend limit, out-of-bundle charges will apply. See our Pricing Guide for details.

5. Experiencing slow data

Slow speeds or delays may be due to network congestion, poor coverage or device issues.

Try:

• Updating your device software.
• Closing unused background apps.
• Restarting your device.

Tethering (Personal Hotspot)

Tethering lets you share your mobile data connection with another device. This can quickly use up your allowance.

Settings vary by device but are usually found under Settings > Mobile Data > Personal Hotspot (iOS) or Settings > Network & Internet > Hotspot (Android).

Roaming abroad

Roaming allows you to use your plan abroad. Some services may not work in certain countries due to local restrictions.

If you’re having issues:

• Check your roaming settings.
• Restart your device.
• See our Roaming guide for more detail.

✅ With these tools and tips, you can take control of your data, avoid unexpected charges, and stay connected wherever you are.