Hey guys and girls. I have a question my ma got the lumia 710 and the tmoble rep said that you need 3g,4d wifi for the gps navigation to work and will have to buy a data plain.. But on her older nokia it used OVI navigation and didn't have to use data it ONLY used the information from the satellites and the cell antenna. On the lumia 710 I downloaded the usa maps from that drive program. Is the tmoble rep bull sh**^ing or is there a way to use the gps without using data?