Question about Samsung SYNC SGH-A707 Cellular Phone

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My screen reads "SIM not allowed MM#3", and in the upper right, next to the icon showing how many bars of reception I have, there is an icon of a phone handset with a red slash bar across it. I cannot place or receive calls, nor can I access voice mail. Help!

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This means you have no service in the place the phone is at.

You need to go somewhere where you get full service and try it.
power down,remove battery,replace battery, then see what it says when you are in a place that you would get good service.

Still have problem, go to your phone carrier and have them check the sim card and your service, it could be your shut down.

Posted on Feb 05, 2010

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Posted on Jan 02, 2017

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