Have you tried a battery pull? With the device on, remove the battery, wait 10 seconds the reinstall and let it boot up. If this does not help, perhaps you SIM car is having issues or you are simply in an area where the cell tower is having issues.
press the call button, menu, phone options, general options --> from there check your area code,phone number length, and most impt, change your "restrict my identity" option to none instead of always. Check with telco about your's security feature. This method works for me, thought i post this here and share with y'all.
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