HI if your Nokia 1616 mobile is displaying "Sim not valid" message this might occur if your phone is locked to any particular network provider cue to this it wont accept other network sim until you unlock it ...You can easily unlock your phone using sites like SuperUnlockCodes.com here they are rendering unlock code for all mobile models at reliable cost ..You first verify that whether they are rendering code for your country and network provider.If yes then pay for it and unlock your phone ...
Sim from wrong carrier or need sim unlock sode
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