one of my n900's has been getting a no sim error lately. this started last week and since then, we have:
-replaced the sim card with a new one
-reflashed the firmware (to the pr1.3)
but still haveing the same issue even after a full flash (not OTA)
anyone had this issue and resolved it? or do you think it needs to be sent in?
go to your service provider and have them supply you with a replacement SIM and see if that works. i had to do that for my n97. ended up being that the guys at the nokia care center bricked my n97, so i ended up getting that replaced too.