IPhone 5 iOS 7.1.2 cellular network problem after reset

It was working just fine before I resetted my iPhone..I'm running on iOS 7.1.2 iPhone 5 32gb.. Does anyone know what cause this thing to happen?
it just a fully reset using phone itself..and I did ask apple store n the did the software fix and nothing change..still network prob..no service, searching for network, got reception but cant use it, got reception but stuck on edge and bla bla bla bla..wifi working just fine.. i did ask technician about this matter and they said if software fix doesn't fix anything then it's totally prob on my board..but seriously just a reset totally ruin my network..???i did go to my carrier provider..did replaced the new sim and bla bla..still the same.. So please anyone guide me on this and if someone know how to fix this I really appreciate that..thanks a lot.. Mine no more warranty..

There is something wrong with version 7.1.2 cause my 4S has issues after updating to 7.1 with Bluetooth and WiFI (they disconnect)... its impossible to go back once the first version 7 is done... sorry... you have to, either wait for an update from apple or make them change your phone! I had to change 2 times my phone 4s before i realized it was after the update.
William!

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