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What's your phone Brand and model?
Your phone says "Invalid Sim" means that your phone is locked to Particular Network.To solve this problem you need to get your phone unlocked.You can unlock your phone from Network lock using unlock code.You can get the unlock code for your phone from your Network service provider or any third party online vendors like SuperUnlock codes.com here you need to specify your phone model.country,Network name to which it is locked,IMEI number of your phone.Then they deliver unlock code to you through mail with unlocking instructions.Using this you can unlock your phone from Network lock easily.
"Invalid sim" means that your phone is locked to particular Network.To solve this problem,you need to unlock your phone.You can unlock your Samsung SGH-A177 phone from Network lock using unlock code.Unlock code is the best and safest way to unlock phone. You
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code to you through mail with unlocking instructions. By using this you can
unlock your phone easily.
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