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 If your SIM card is a prepaid card, to sure whether the card is insufficient. Please turn to your network provider, and to sure whether to be refused registration network by other reasons. Weak signal or no signal You may be in a location where the reception is bad, such as tunnel or cellar, please relocate and try again. You can try turning around slightly or get near the window if you are in the room. Bad talking quality Weak signal, you can try solutions above Low battery, change a new battery or charge the battery Use up volume key to adjust microphone volume Can’t make a call Check if you enter the correct number and press send key Check if you set call barring, if yes cancel it Can’t receive calls Check if your phone is turned on Check if screens shows no signal, if yes, try solutions above Check if you set call barring, if yes, cancel it Screen is dark Check if battery is low, change a battery or charge the battery Adjust the brightness in settings Your phone may be affected with damp, keep it dry 28