Hey Ryank42,
Sorry to hear its not working with the 770. Just wondering which version of the OS on the 770 are you using? Correct me if I'm wrong but I'm not sure also which version of bluetooth the 770 has. The 800 is 2.0 while the 770 is 1.2 and maybe the Pearl 2.0. It should be backwards compatible but maybe the dial up networking was only updated for the 2.0 profiles. I've never had a 770 but it may also be the OS on the 770. Just some ideas.