Remove the SIM and SIM tray, and blow into the SIM port. Clear all debris from the SIM port, this may help? Compressed air usually does the trick for me.The past week or so it's happened about 3 or 4 times, phone doesn't work and say No SIM. I power phone off the back on at it's back to normal. Is this a sigh of trouble ahead? Thanks.
My iPhone 4 did that twice in the first week that I owned it (it was brand new so I don't think it was dust). It did it once again about twelve months later. I never figured out what caused it. I just reseated my SIM each time it did it and it then it was fine.The past week or so it's happened about 3 or 4 times, phone doesn't work and say No SIM. I power phone off the back on at it's back to normal. Is this a sigh of trouble ahead? Thanks.
An alcohol wipe works well.Take the sim card out and use a small eraser to rub the gold contacts. Put it back in and I bet you won't have any further issues.
Mmm, strange. If you've cleaned the SIM and the SIM port you could always try a restore. When/if you restore set the phone up as new.It's on my iPhone 4, just downloaded iOS 5 last week. But the no sim had happened even before I had ios 5.