A huge problem I have had with my Apple 4S Is that it keeps on saying Sim Failure and i am unable to make calls. To make it work you have to restart the phone (this does not always work either). Many of my friends are experiencing the same problem along with other problems. If you do a search on the problem you will find many people with the same thing happening with their phones, apple and the service providers blame each other for the problem... I'm going to try my luck with and see if i can get my phone changed over.
good luck.
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