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ItemsHow can I change the default ringtone and adjust the volume for incoming calls
What should I do if my display screen broken?
How can I know whether my device will work with my SIM carrier?
What should I do if my device network signal is weak/there is a low reception level?
What should I do if the in-built applications of my device do not work?
What should I do if my device cannot connect to the internet using mobile data?
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