Hello, i bought 8310 and my question is can i use gps, without gps blackberry service. Lets say on pay as u go. No internet and BB service. would be possible to use it? If no what do i need to do to make it work?

You can use the gps, but any software you use with it will need data service.
You are going to need a data plan

Not ALL software requires data service... I believe there are two that don't, look at the GPS section here....
All known GPS applications