How to Check Your Mobile Data on EE, O2, Vodafone and Three

EE

1. 1App: open the EE app. Your remaining data is on the home screen. Tap Manage, then View full usage for more.
2. 2Text: text BALANCE to 150 from your EE phone. It is free, and the reply shows your remaining allowances and any extra charges.
3. 3Online: log in at ee.co.uk. Or go to add-on.ee.co.uk on your phone with Wi-Fi turned off, so it reads your EE connection.

EE texts you when you've used 80% of your monthly allowance. If you have unlimited allowances, EE only shows the ones with a monthly limit.

O2

1. 1App: open My O2, sign in, go to My Allowances and choose Data to see what you've used and what's left.
2. 2Online: sign in to My O2 in a browser.

O2 texts you when you've used 80% of your data allowance, and again at 100%. We couldn't confirm a current text code for data on O2's own help pages, so use the app.

Vodafone

1. 1App: open My Vodafone and go to your data to see how much you've used this billing month.
2. 2Online: log in to My Vodafone at vodafone.co.uk.

Vodafone says it lets you know when you're getting close to your monthly data limit, and again when you reach it. Vodafone's help page on managing data doesn't list a text code for checking usage.

Three

1. 1App: open the Three app. The usage tab shows your data allowance and how much you've used.
2. 2Online: log in to My3.

On Pay Monthly, Three texts you at 80% and 100% of your data. On Pay As You Go, it texts you when you've run out. Three's help page doesn't list a text code for checking data.

What your network shows, and what it doesn't

UK networks show data for your number against your allowance: how much is used and how much is left this month. That's what decides when you run out. Their usage screens are built around your allowance, not around the apps on your phone or the devices on your hotspot.

Hotspot data comes out of the same allowance. O2 warns that hotspotting can eat a lot of data, and Vodafone suggests cutting down how much you tether. If your allowance drops fast while a laptop is connected, that is the first place to look. See Which Device Is Using All My Wi-Fi Data? How to Find Out.

Why the two numbers don't match

• Different start dates. Your network counts from your billing date. iPhone counts from the last time you reset the statistics.
• Different measuring points. Your phone measures on the phone. Google notes that some carriers measure usage differently.

Your network's number decides your allowance. Your phone's number shows the cause.

See which app used your mobile data

On iPhone: open Settings > Mobile Data (or Mobile Service) and scroll to the list of apps. Reset the statistics on your billing date so the total lines up with your network. Full steps are in How to Check Data Usage on iPhone.

On Android: open Settings > Network & internet, tap your SIM, then App data usage (on Samsung, Settings > Connections > Data usage). You can also set a data warning on the same screen.

To use less, see How to Save Mobile Data.

In the US? See How to Check Verizon Data Usage (and See Which App Used It), How to Check AT&T Data Usage (and See Which App Used It) or How to Check T-Mobile Data Usage (and See Which App Used It).