My sony ericsson is asking for a pin when i turn it on but i dont know the pin.the phone is a c902

What is the problem with your Sony Ericsson C902.?
If you are seeking for an unlock code you can get it from http://www.onlinegsmunlock.com/sony-ericsson-c902/rs7wp9/ at affordable and low cost.

please dont remove your battery or power off your phone because it will hang up only to the sony ericsson logo
it happen to me also

try 0000

The C902 can't be unlocked via code or free software. However, if you look around your local area, you may be able to find a phone unlocking service. They've got the right equipment to unlock your phone, and isn't very expensive.

If this is the case check the following things

1. Battery power / Replace a new battery
2. Other than that you cannot handle the situation, kindly go to the service center and ask him to see there is any virus or software issue in your mobile.

Thank you.

I forgot the security code sony ericsson cyber shot

here
http://www.mobileunlocksolutions.com/sony-ericsson-c902/rs1wp9/
u can get your mobile unlocked at very low cost , safe & secure..it gives you best solution.

Take it to the dealer you received it from, ask to try a different charger i think the problems there.

Hope I`ve helped

Becca, PUK and PIN are in the domain of the service provider,ie, Vodafon in your case. Please contact the Vodafon Helpline to get the PUK. Generally it is 00000000 (eight zeros) unless you have changed it.

try installing the latest software on the phone from te sony ericsson website, this usually works