EQO is designed to provide a single place from which you can view and connect all of your contacts via voice calls, text messages, SMS, or instant messages. EQO software supports AIM, Google and Yahoo instant messaging, photo sharing (you can insert a picture in EQO messages or links sent via IM or text message), the free exchange of messages with other EQO; the ability to send messages or to EQO and twitter status updates and RSS-feeds.
The service, currently in beta, working on various BlackBerry, LG, Motorola, Nokia, Samsung and Sony Ericsson phones. I tested it on the BlackBerry 8900 Curve. Simply register your mobile number on the EQO site, and a link to a download site, arrived on the phone using text messages. Installation is very simple, and to dial the number, simply enter it in EQO interface; phone then connects you to call a local access number, which EQO is used to route calls over their networks. (All of this takes place against a background of, you may not even notice it.)
EQO is the best voice quality of the four services I tested, but it still was not as good as a regular mobile phone call. Voices were less crisp and sounded a bit hollow, but overall, everything was clear. EQO prices significantly higher than in other services, ranging from 2.3 cents per minute. And even calls between EQO users are not free: They are half the cost of legal service calls.