EQO, a service that promises free IMs and low-cost international calls and texts on cell phones, has just released a version of their client for Symbian S60 3rd Edition smartphones.

Supported models range from the relatively low-end Nokia 3250 to the flagship N95. Perhaps the most useful ability of EQO's software is its IM feature, which supports YM, GTalk, and MSN, among many others.

You can check out EQO's nifty rate calculator on their home page. Keep in mind that EQO's fees don't include what you're service operator will charge for data plan/mobile connectivity usage.