Originally Posted by mrogers
You need to actually provide us with some information before someone can help you. First of all, how about telling us what BlackBerry model you have? If it is a CDMA model, the term "unlocked" doesn't exactly apply the same way it does with GSM phones. Often, you can't interchange phones from different CDMA carriers, at least in my experience. For example, Sprint wouldn't let a Verizon phone on thier network.
If you have a CDMA device, you're probably limited to whatever carrier it's branded for (probably). If you have a GSM device, then no you can't use Sprint, because they're not GSM! You'd have to use it on Cingular or T-Mobile.
To offer my 2 cents on this, here is a little bit more of an explanation...with cdma devices, they are attached to the network through serial numbers and information on the actual device so the carriers are able to limit the range of serial numbers that are allowed on their network. With GSM, everything is done through the sim cards and aslong as your phone will support that sim, then you are good to go. Long story short, chances are you are going to have problems using an "unlocked" device with sprint unless it was actually obtained through them and if it is a gsm phone (look for a spot to put a sim card) then it won't work at all with sprint...