Unlocking your phone.....
If your provider is a CDMA (like Verizon, Sprint) you are out of luck.
CDMA phones do not have a Sim Card.
Too bad. So sad.
If your provider is GSM (T-Mobile, AT&T) you have a chance.
GSM phones do have a Sim Card.
Note: Some provides have now switching from CDMA to GSM (therefore have both)
With any luck, you can unlock your phone by typing in a “secret” number into the key pad.
Go to eBay, search for your phone, plus the words... unlock code.
With any luck, you can buy the code for $5 or $10, and do it your self.
But, if you bought a “good” phone it may require to be hooked up to something to complete this.
You can try to “send it away”, or pay your provider.
If you (heaven for bid) have a smart phone.
You are too much of a “cash cow” to be let go, without a fight.
Just like your phone, things are a lot more complicated.
Read this for more detail......
http://electronics.howstuffworks.com/how-to-tech/how-to-unlock-cell-phone.htm