we implemented a program which sends sms through 6210 by using Nokia PC Connectivity 2.1 and it works. We need to use 6310 so we got PC Connectivity 3.0, 6210 works with 3.0 too but when i try to use 6310 i got the error 7689(communication error between device and PC). What maybe the possible reason for that? do we need any change in code? or is it a problem with telephone?