My iphone has no service after i upgraded to 4.3.2

I just upgraded my iphone from 4.0.2 to 4.3.2 and now there is no service and i have an unnofficial sim card because there is no at&ts or any official sim card here in cambodia and its just been a very dissapointing 4 weeks please help

I am having the same problem. I have a normal iphone4 and when I upgraded to ios7, suddenly no one can hear me on calls. It works with speakerphone and on a headset, and I can play music normally. It has to be software, or else why would speakerphone work? My phone also functioned just fine before this upgrade and now my phone is useless as a phone.

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