Iphone 4s won't call out or receive calls or messages

Question

got my self a iPhone 4s off my friend locked on Vodafone phone was working fine to I got it unlocked after a few days it just kept on saying call ended right away. I was so confuse  I try every thing to sort it out and I mean everything even went to Apple store and they done all there tests and said I need a new phone as it has hardware problems and I need to pay £160 for a replacement phone as my warranty run out = ( and you think I'm going to pay that when I just bought this phone off my friend noooooo way .... I thought I try one last thing as I had full t-Mobile signal and 3G and Internet but could not call out or receive calls so weird anyway I thought I'd put a Vodafone chip back in the phone as it's was locked on Vodafone before and see what happens and guess what no service so that got me thinking that the phone has been blocked . So I phoned up Apple and give you IME number to see if it was blacklisted and they said it ain't ?????? So what now well I got my friend to call Vodafone up to see if they blacklisted it and guess what there did as my friend lost the new phone they got and Vodafone decided to block both serial numbers how fun for me not. so now they have un blacklisted my phone and it works just fine = ) lucky I did not pay apple for a phone hey don't believe everything they say and don't give up

Answer 1

Good morning.  Recently I had the same problem - I could not access the cellular data network.  I was informed by our local Internet Service Provider that, every so often, the phone (iPhone 4S) would reset itself.  In so doing, it purges some information that is really needed.  The ISP had to walk me through the steps to re-entering that info; after that, it worked just fine.  She said that they have instruction cards available at the ISP's office, and that I should go get one for future reference.  It may be a problem connected with relatively small providers – it's not a nationwide carrier, like Sprint or AT&T.  She asked me, "Didn't they tell you about that when you bought the phone?"  Well, of course not.  Live and learn!