Seen many posts already regarding this, but canā€™t seem to make it work. Data roaming turned on, APN changed to mobile.data.co.uk anything Iā€™m missing? Every time I switch WiFi off I get hit with the ā€˜Could not activate mobile data networkā€™ message, thanks Reboot the phone. If you have an iPhone change your data APN to "mobile.o2.co.uk". If still not working then contact O2 to remove the Roaming bar on your account. I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. 7. Remove and Reinsert Your SIM Card. 8. Check Your Mobile Data Limit. 1. Quick Ways to Fix Mobile Data Not Working on Android. Before trying some of the more technical fixes, start with these quick and simple fixes that may be all you need. Restart your phone. Itā€™s obvious, but that quick reset fixes numerous issues. Guide How to Top Up (PAYG) Go to any O2 shop or anywhere you see the green top-up logo and ask for an O2 top-up. You can pay by cash or card. Then call 4444 free from your mobile, or 08456 062 277 from a landline, enter the number on your receipt and follow the instructions. Then reach out to O2 on Social media, links below this post, for help Simple solution eventually. Re-enter the right APN codes (ie I data.o2.co.uk etc etc) and make sure under Settings // Cellular that EU Internet is OFF. Now works (as long as u r signed up to the O2 international travel plan) Solved: I got the O2 sim specifically to use in Europe. I am on the O2INT tariff. A charge of Ā£6 per day applies to use your phone in Zone C and Zone D. Unlimited data Xtra plan with 4 Xtra benefits - Inclusive roaming in Zones A, B and C for no extra cost. Using your phone in Zone D incurs a charge of Ā£6 per day. Vodafone Basics - These low-cost plans do not offer inclusive roaming of any sort. Get help with your device, O2 account and more. Phones, sims and devices. Pay Monthly. Pay As You Go. Digital services. Account and billing. Network coverage and international. Apps. Safety, security and fraud. 1 ACCEPTED SOLUTION. The O2 system uploads and updates the system every day at midnight and shows the data used during that day. It's possible that apps are constantly updating and wifi switches off and uses mobile data when the phone sleeps. PdwZ2.

o2 data not working abroad