Hello GrizTrack. I just copied and pasted this from tomtom's website
Compatibility
Plus Services & Hands-free Calling
* T Mobile: Nokia 3660, Nokia 6600, Nokia 6620, Sony Ericsson T610, Motorola V330*, Motorola V360*, Motorola RAZR V3
* Cingular: Sony Ericsson T637, Nokia 6620, Nokia 7610, Nokia 6230, Nokia 6600, Motorola RAZR 3, Motorola V551, Motorola MPX220, Audiovox SMT 5600**, Motorola ROZR E1**
* Verizon: Motorola V710*** (GO300 & 700 only)
Only Hands-free Calling
* Cingular: Sony Ericsson S710a, Imate SP3, Imate SP3i, Siemens SX66
* Verizon: Audiovox XV6600, Motorola E815, LG VX8100, LG VX9800
*Only when configured using the Motorola V551 setup and choosing the T-Mobile III option
**Manual settings required
*** With 5.420 update and phone ROM version .03 only (GO300 & 700 only)
The listed devices are recognized and supported by TomTom GO700, GO510 and GO910. When another device is used, it might be necessary to set up the connection manually. Consult our Support pages for instructions