If you are trying to send a file from the V3 i.e. a picture goto the picture in multimedia, press menu > copy. It will ask if you want to power on bluetooth>press yes>Already paired devices will show or click on "look for devices" it will then pair once it has found another device. The receiving person will then receive a message asking whether to accept the incoming transfer>press yes>copy starts.
If you are receiving on a V3 Goto - Bloutooth>setup>Find me. while discoverable the other person should follow more or less the same steps. One you have paired with that phone you will not have to do it again. Hope that helps