iPhone 4 - 3G showing but no internet

[Anonymous]

Been using my iPhone 4 for 18 months and been ok but extended my contract and a few days later I can't use the internet. 3G shows, can make calls and standard text messages but can't access the internet as it says "Could not activate mobile data network".

Checked all the settings (idata.o2.co.uk in Mobile data), switched off/on the 3G, changed the carrier from O2 to another and back again and also rebooted but same issue.

Any idea's? 

[Anonymous]

Have you tried a restore, try restating your network settings then input your password again

[Anonymous · Accepted solution]

Also check that when you extended your contract that the iPhone data bolt on wasn't removed