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Hi you can perform this Basic trouble shooting
Perform Power Cycle.To switch the phone off, press and hold the Power key. 2 Tap Power off. 3 Tap OK to switch off the phone. 4 Press and hold the Power key to switch the phone on. Wait until the Home screen appears. 5 Perform Soft Reset.Press and hold the power key to switch off the device. 6 Tap Power off. 7 Tap OK to switch off the phone. 8 Remove the battery (depending on the handset unit) and SIM.
Place the SIM and battery back to device.
Press and hold the Power key to switch the phone on. Wait until the Home screen appears.
9 If you have spare SIM or device, perform SIM/Phone swapping.