Why is My iPhone stuck on searching for signal?

My friends decided to send me a message with the bug that powers off your iPhone as a prank, and I got it so many times that it just completely jammed my signal. In places that I would usually have 4G service, I have none. I have tried rebooting my iPhone, and resetting everything, and taking out my SIM card and putting it back in and still no signal.

So you tried resetting your network settings?

Settings > General > Reset Networks Settings?