What can be done when phone does not switch on?

When phone is not switching on, first change the battery if the phone is not used for long time.May be current in the battery is dropped down for not using it for long time.If the phone is used regularly, and phone is not switching on, Insert the charger and check whether the phone is entering into charge mode or not. If the charge process is on and indication is shown, the problem will be with power switch circuit of the mobile phone...

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