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Mine does that if the battery gets too cold. I have to take off the back and take the battery out and put it back in and then it turns on again. Annoying. But it's already a replacement for the last one that broke.
1-Turn on the phone without sim card . 2-Pull off the battery cover and insert any non-accepted sim card (without turning off the handset) 3-Do full reset *2767*3855# , phone will reboot and goes to Menu . 4-Customize Sp-lock code *7465625*638*00000000*00000000# 5-Unlock your phone with new SP code #7465625*638*00000000# 6-Enjoy G600 unlocked
Take your phone to your local market & ask any market phone repair vendor to fit a new keepad membrane, if this doesn't work it's trobably irriparable damage either caused by water or the fumes of some kind of solvent for example super glue.