Nokia E51 phones can be unlocked to allow them to work with any carrier's SIM card.
Telephones that operate on the Global System for Mobile Communication (GSM) network are sometimes locked to a particular provider's network. GSM phones are designed to work on any carrier's network by simply changing the phone's Subscriber Information Module (SIM) card. Phones that are locked to a network will not switch networks when a SIM from another carrier is inserted. The Nokia E51 is a GSM phone that can work well on any global network. If yours is locked to a particular cellular provider, you can remove the lock to allow it to work on any network in the world.
Instructions
1. Insert a SIM card into the phone. If one isn't already in the phone, slide the back of the phone down to remove the battery cover. Remove the battery by pulling up from the bottom. Slip the SIM card with the notch to the top-right into the SIM holder above the battery compartment.
2. Find the International Mobile Equipment Identity (IMEI) for your phone. There are a couple of ways to do this. One is to remove the back from your phone and look at the sticker under the battery. The number is printed on that sticker. The other way is to enter the code *#06# on the phone's keypad. Press "send" and your phone will display its IMEI. Some E51 language implementations may call the IMEI a "Serial number."
3. Once you have the IMEI, either enter the IMEI and your phone's carrier into the unlock code generator or on a website that sells unlock codes. Some independent cellular phone retailers, especially those outside of the United States, will also sell you an unlock code.
4. Remove the SIM card from your phone and replace the battery.
5. Power the phone on and enter the unlock code. Many commercial unlock code services will provide several codes in case one doesn't work. Unlock codes are in the format #pw+555 979 5076+3#. If the code is accepted, a message indicating that the SIM restriction is turned off will appear.
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