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I´ve bought an unlocked iPhone 4S in the US last March. Since that I´ve been using it in Argentina with no signal problems.
A week ago I got the "No Service" where it used to be the carrier...
Please let me know what should I do!
Thanks in advance.
Sergio
In Settings App toggle on off Airplane Mode, leave it OFF. See if this helps. Settings App>General>Reset>Reset Network Settings. See if this helps. Restore iPhone Firmware with iTunes on computer. Contact your Carrier make sure it is not their fault or problem with your account or SIM card.

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