IPhone 4S constantly "searching" for network, even when SIM card is taken out.

I have tried resetting the network settings, restarting the phone several times and also doing a manual reset (holding down home and lock button).
So far services comes on once in a while, but then goes to "searching" mode 10 minutes later.
Thinking this could be a hardware problem, but hoping someone out there is having/has had a similar problem and can give me a hand.

Hi and Welcome to the Community!
Based on your description, I suspect the SIM card to be defective or otherwise the cause of your issues. I suggest you seek out a replacement from your mobile service provider.
Good luck and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
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