If you are looking at selling your Palm Treo and getting the most for it you might want to consider unlocking your phone. Typically when you purchase a cell phone, the company that sold you the phone (ex: Cingular) ‘locked’ the phone before you bought it, so you can only use it on their network. This means that you can’t use your phone on any other network, even if you change the SIM (which is an abbreviation for Subscriber Identity Module) card. The SIM card is the little piece of plastic that identifies your phone to the cellular network. Changing your SIM card to have your phone work on another network is useful especially if you want to travel to another country and want to buy a pre-paid SIM card so you can have cell phone access without roaming charges. It also increasing the phone’s resale price. Check out http://600unlock.com/ for your Palm Treo 600, http://650unlock.com/ for Palm Treo 650 and http://680unlock.com/ for Palm Treo 680 smartphones.
Update (2008-08-11) : Check out this site for cell phone parts (original replacements parts) and unlocking of all phones: http://www.cellphone-repair-shop.com/products.php?cat=44
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