This application can be found on many Nokia phones.

Please see the wiki for more details.

We recommend the X-Lite for MAC as a free softphone.

Download

For windows mobile we recommend PortSip and Fring.

JimmyIM is a tiny application for mobiles. Unfortunately doesn't support the SIP protocol, but can be used to chat with MSN, Google Talk and ICQ users.

More details and dowload

Mizuphone for iPhone

Bria

Mizuphone for symbian

Fring

and

devices

Wiki