Can I restart my iPhone 4 connected to metro?

I had gotten this iPhone 4 unlocked originally with sprint and converted it to metro now my calls section is stuck on a call and won't let me end it, I've tried many procedures but I'm afraid if I try to reset it by turning it off and back on I won't be able to turn it back on or il lose data or might even have to pay money to reset my phone please help… Ps the lady that did the change for my phone told me it can't be turned off but if any one thinks different or has any info on how to fix this problem please I'd appreciate it.

Hi these two carriers might not be compatible. Try to ask Metro what to do.

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