If you are still under warranty period, you can get it replaced. Or else get it rectified from any nearby Nokia service center.
HI what network problem are you facing in your Nokia lumia 710 mobile .If your Nokia lumia 710 mobile is not accepting your network sim whether it is displaying messages like sim invalid ,sim lock and so on once you insert your sim in it then it mean your phone is locked to some other network provider due to this it wont accept your sim until you unlock it .You can easily unlock your phone using sites like MobileUnlockSolutions.com they are rendering unlock code for all mobile models at reliable cost ...You first check that whether the code is available for your country and network provider .If yes then pay for it and unlock your phone ...
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