It looks like a USB cable.
One end should be attached to computer and another may be to yr phone.
It's for data transfer functioanlity i think.
Sorry I should have been more clear - I know it's a USB cable to connect a phone, I'm wanting to know what phones this is for and the model of the cable
Hi bugme! Welcome to Nokia Discussion boards!!
For me its hard to guess which data cable is it. May be some one who have already used this could give you a quick reply!
In the mean time please check whether any thing/numbers/short codes are written on the cable, so that it would be easy to track the data cable model.
BTW, from where you got this cable, why dont you ask them about its usability/connectivity?
Looks a bit like the one I use for my XDA2.
Here's a picture of that one: