Motorola Droid Razr M Sim Invalid Or No Sim Card

I Have A Motorola DroId Razr M xt907 Which Have A Problem With The Sim Card
When I Insert My Father Sim Its Working Fine
But When I Insert My Sim Card(Which Is Same Network) It Says Invalid Sim Card
I Have Tried My Second Sim Card It Says No Sim Card
Any Solution For This Problem
And Sorry For My Bad English
I need Help

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invalid sim card message after changing carrier #help!

hi guys
i own an liberated at t e 980 i was using on a carrier for a while and them i change for other carrier and have been using booth of them switching the two sim card between the lg and other phone. but since yesterday try to change the main sin card to the lg and it stop from recognize it. the sim is OK it works in the other phone and the other sim works in both phones. i erase all security apps, reset, put it on airplane mode and nothing seems to work.

i appreciate any help you can give me or if there any tread that that some info about this problems
thank you for your help

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