My daughter has my old iPhone 4 and it started doing this. I restored. It did the same thing after a few minutes..... I restored again, and again.....No difference. So I searched the internet and tried everything possible. (New SIM, turning off the PIN code, turning off 3G, Restoring in various modes.....etc, etc)
I was about to throw it against the wall................
"Wait.....", I thought to myself..... Sometimes it doesn't register that I take the SIM out, and sometimes it didn't register when I put it in, or it took longer than normal to notice.
"Maybe the contacts are corroded or covered in dust?". I sprayed WD40 onto to SIM and inserted it. Voila!
2 days and it hasn't lost signal. Hasn't asked me to restore. Runs perfectly, again.
I can only think that the contacts were dirty. No idea how because it's in a case, and the SIM hasn't been out...... Almost 2 weeks of stress and head scratching for a quick squirt of WD40.
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sorry,couldn't mention above.i have an iphone4 GSM!
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sometimes it shows "RESTORE NEEDED iPhone cannot make or receive calls,please restore!"
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