My iphone won't keep a signal and settings app crash's when i go in cellular?

Hi there i'm new to this i recently reset network settings on my iPhone 4S running iOS 7.0.4 since then my phone won't keep a signal it will say the operater name for 10 sec then lose 3G and just show signal bars then it says searching then it starts all over again I have tried different Sim card in the phone it will not make a call or receive i really need help because its my only cell phone and i have no way of contacting important business clients thanks in advance to anyone that can help. By the way when i go into settings app and press cellular the app crash's any help would be great
iPhone 4S, iOS 7.0.4

I would try restoring the phone in iTunes. If that doesn't work then take it to Apple or qualified repairer. The issues mostly seems like the hardware issue, but do try doing a complete restore in iTunes

If you need any help just email me

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