unlocking phone question....?

[Sdfsd Sdf]

ok so i just bought a cell nokia c3...ive never unlocked a phone...but i want to unlock it so it will be my first time....so what im curious to know is i found numerous websites that ask u to fill a form asking you IMEI number and they email you the unlock code. My question is, is it safe to give IMEI number? i dont know what it is so is it some personal number like serial code that no1 shud know?>
1 more question is ive spent 40 minutes i cant find anywhere how to raise the speaker volume..

[vicecaptain]

You can't unlock your mobile phone without specifying your IMEI number. Since network locks are unique and based on IMEI number of the device, It is necessary to mention the IMEI number. But be careful in selecting a reliable source to get the unlock code. There may be certain unsafe sources too.
One of the safest source to get the unlock code for your Nokia C3 is www.TheUnlockSpot.com here, You can get the accurate unlock code at affordable cost with easy unlocking instructions by specifying the IMEI number, country and the network to which your Nokia C3 has been locked to.