iphone 4s" could not activate cellular data network", "you are not subscribed to a cellular data service'. Put sim card in another phone and internnet works
I have a secondhand iphone 4s that was with Telstra and all works fine. I put an Optus sim in and it says " could not activate cellular data network", "you are not subscribed to a cellular data service'. Put Optus sim card in another phone and internet works. Please help.
iPhone 4S, iOS 7.0.4
