Before we get into the unlock code input instructions for a Palm Treo 680, it is important to point out that the instructions for a Treo 680 are similar to those of a Treo 600. You can use the same steps and guidelines to input the unlock code in a Treo 600 as well.
This article assumes that you already have Treo 680 unlock code. The first step to input the code is to remove the battery and insert an incorrect SIM card. An incorrect SIM card in this case would be a SIM card that did not originally come with the phone.
Power on your Treo. At this point you should get the message 'SIM Not Allowed'. Click Ok. Go to the dial pad, and use the stylus to enter MEP code. The MEP code must be entered in the following fashion. Enter *#*#(MEP-CODE)#, where MEP-CODE is the unlocking code provided to you.
Once you have entered star pount star pound (code provided) pound, then press dial.
For example if the code provided to you is 12345678, then the code must be entered in the following manner *#*#12345678#.
Remember there are no dashes, spaces or periods allowed. After you enter the code, press dial. At this point, the phone will display the message 'SIM Lock Removed'.
Once your phone is unlocked, it can be used with any network to make voice calls on that network. However, remember that if you have a data plan with the new carrier, the network setting will most likely need to be changed in your Treo for it to access the web or utilize other data related services.
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Source: www.articlesphere.com
