Could not activate cellular data network: You are not subscribed to a cellular data service.
iPhone: Could not activate cellular data network: You are not subscribed to a cellular data service.
Turns out, the new firmware checks with AT&T’s servers to verify that you’re on the iPhone data plan. If you’re on any other data plan, you just lost access to data services.
I am on the smartphone unlimited plan, since my old phone was a windows mobile phone and just swapped the sim card to an iphone. Beware to those not on the normal AT&T iPhone plan – updating will kill your data service, even if it’s been working fine up to now.
Find an open wireless access point.
Browse to http://www.unlockit.co.nz/ from the iphone.
Select “Use Custom” and pick “US – AT&T” from the scroll list.
Install the new APN.
Turn off 3G.
Turn flight mode on and then off.
You can uninstall the APN later if you desire. This solution also works for people on the GoPhone prepaid data plan who don’t want to convert to a contract.
– Under Cellular Data Option