How to Unlock a Cell Phone for Any Service Provider

1. Ensure that your cell phone has a SIM card. You may do this by checking it physically (usually near the battery) or by searching online. In the United States, there are two types of cell phone networks--SIM and CDMA. At present time you are unable to use a SIM card in a cell phone that uses the CDMA network.
2. Understand that if your phone has a SIM card, you have three unlocking options available to you.
3. You can call the service provider who gave you the cell phone and ask for an unlock. If you have fulfilled your contractual obligation, the provider will be inclined to give you the code, but don't try to get the code if you're breaking your agreement. Some cell phone companies unlock your phone after a few months of service.
4. You can have your phone unlocked professionally. This is the most hassle-free way, but it's definitely not free. You will probably pay anywhere for $5 to $30 for the unlocking service. There are many sites online that provide this service, without you having to mail the phone in, but you can also find these companies locally.
5. You can unlock the phone yourself. This is free, but it takes some Internet research. There are codes for all SIM capable phones, and usually the process takes about 10 minutes, but this is only if you are comfortable with technology. Be warned that you may irreversibly damage your phone, if you find incorrect instructions.