Phone number shown as unknown. Always says sender is invalid

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                          I have a Samsung Galaxy S SHW-M1105 and it displays my phone number as unknown. Is there a way to change it? And one more when I try to reply a message it says the sender is invalid. Someone please help
                        

Asked by Jacques (31 rep)

Jul 19, 2012, 02:12 AM
Last activity: Aug 23, 2017, 07:34 AM

Phone number shown as unknown. Always says sender is invalid

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