What do I do if my iPhone 5c says searching?

I recently bought an iPhone 5c AT&T from a friend and I haven't even had if for over a month. We had to replace the SIM card because hers wasn't working. After we replaced it the phone had been working perfect with cellular data. But a couple days ago I noticed that it said "searching" on the top left of my screen and won't work without Wi-Fi. I can't send texts and I can't call. I also tried to take the SIM card out to see if it would say "no SIM card" but it doesn't even say that. It also says my phone # is unknown. I need help?!

It sounds like now you know why your friend sold you it, he might have damaged it.

Take it to the shop. The iPhone might be broken, not the SIM card.

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