how I do unlock a cellphone?

[PhantomViper]

Contact ur operator and ask for a PUK code, Once they have establihed who u are and that the fone is yours they should give u this number that ill bypass the lock code.

[MarthaS]

I accidentally pushed the lock button on my cell phone , and now I can't make any calls, it asked me for a 4 character #, but I don't know it.
is a UTstarcom CDM8935C

[HoofArted]

It's not your PUK code or else it would say "Enter PUK Code". You locked the phone and by default, the code is the last four digits of your phone number. By the way, PUK codes are only for GSM phones as the codes are sim card dependent codes. CDM phones I do believe are made by Audiovox which is a CDMA phone.