My battery is fully charged but my phone wont turn on

Cell phone batteries have what is called a "memory" over time if they are charged without being fully drained they can start to not hold a charge. Unfortunetly the only fix for an issue like yours is to purchase a new battery. Your local retailer / service provider should have batteries in stock or they can order one for you.
It is recommended to allow the batteries to drain completely before charging, then allow at least 8 hours or more to fully charge. Most cell phone will show a full charge after a few hours, but this is more a fault with the software that check the batteries charge, then an actual indication of the battery being fully charged.

sir my phone gt c3262 and my phone all setting rest my phone game not downelod plz helf me sir

either a battery problem or it needs a new mother broad

first thing i would try is some kind of electrical contact cleaner. spray a little on a tooth brush, and clean the charging port. do this with the phone off and battery out.

i think your on button is broken
!....

yes the battery is dead. replace it. cant help ypu anymore as you alone can replace it.

As the phone keeps turning on off there is some loose contacts or some dirt is there at battery terminals try cleaning phone and battery contact terminals

If the phone is unable to turn on, even if the battery is fully charged it really needs service.

go to a professional mobile repair tech and have the phone fully service and if the does not work have them reflash the original firmware or upgrade the existing firmware on the phone.

Hopefully that corrects your problem :)

my nokia 70 wont turn on