I know is going to sound really strange, but does anyone know of a bluetooth dialer that I can use with my Treo 680? In other words, I want to dial an external phone via bluetooth from my contacts list.

Reason: I travel overseas a lot and keep an unlocked GSM phone with me. I buy a local pay-as-you-go SIM card and use that for local calls and SMS - a heck of a lot cheaper than roaming. Also, I can't change the SIM in the 680 because it is locked (not to mention that I still need to get my US calls).

Any help appreciated.
Thanks
Sunil