when i plug my charger into my phone it keep going off and on
When I plug my charger into my iPhone it does not come on completely but it turning off and on?
Is the phone still charging if you connect it to the adapter? If yes, let it chafe for about 10min, then try to connect in recovery mode if it still does not start up normally.
Follow the steps in this article:
If you can't update or restore your iOS device
If this does not work, the issue might be hardware related and the phone has to be serviced by an Authorized Apple Service Provider or Apple Store next to your place.
You can also contact Apple Support to get this done: