IPhone won't pick up any service?

This morning, my iPhone 4 was working normally. But after church, I noticed some problems. No texts were sending and it wasn't picking up any service. All it said was "Searching… "
This problem continued when I got home, but my phone started to receive texts again only because of my Wi-Fi. Hours later, this problem is still continuing. I mean, it still works at home, but if I were to leave, I would not be able to make any texts or calls because it won't pick up any service.
What is the problem here? Will I have to go to a Verizon store or call Apple? I tried Googling this before coming here, but I didn't really find anything.

You need Wi-Fi dimwit

Try a few things like turning it off and back on again. Or taking the sim out and back in again. Hope this helps x

If this is specific to your phone, then it is most likely a problem with the hardware picking up a signal. Your best bet would be to go to an Apple store and have one of the employees at the Genius Bar take a look, since they should be able to tell you what is wrong and fix the problem.

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