SOURCE: No network k790i , not SIM problem
at times the cover of your phone might also block the signal to your network.. try removing your cover...
SOURCE: No Service!
it is the normal phenominene of samsung mobile to leave signels so on that time u need to restart your mobile or search it mannualy and select the network. this is the only solution of this no other service center can repair it so this is only one way to solve your problem.
SOURCE: I have Iphone clone and I get ''no service'' when my AT+T sim card
are you sure the phone is UNLOCKED or not?
If it is completely UNLOCKED, you can find the solutions of the UNLOCKED Cell Phones here.
http://www.onthesource.com/technique-support/solutions-of-unlocked-cell-phones/
SOURCE: sim card error: contact sim card provider
contact sim card provider eror sony ericsson 013-6960687.
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