[Resolved]  Nokia 1650 — forget security code

hello sir,
i have purchased new set of nokia 1650 few days back.after some time, i changed my sim from idea to aircel and used it for some time. when i changed again from aircel to docomo and one day i went outside there is no charging in my cell.i switch of it . later i switched it on it shows enter security code. i had not given any codes. this is my problem. so i request you please give me the solution for this and help me.
thank you sir,

yours truly,
maheshvarma.

nokia security code 1650

IMEI : 354870/02/024325/7
RM-305
CODE : 0549264