iPhone 3.0 APN & MMS Cellular Data Settings
Aug 10, 09:56 AM by Steve Gerrard
I recently started getting the message “could not activate cellular data network: You are not subscribed to a cellular service”. The way to solve this is to go to the “Cellular Data Network” stting under the General/Network option, and change the data APN from idata.o2.co.uk to mobile.o2.co.uk.
Also, for MMS you should change the APN from idata.o2.co.uk to wap.o2.co.uk.