S-unno是由MediaRing网络电话演变而来，S-unno主要功能免费的PC2PC通话，低费率的网络电话，未来将逐步增加更多服务内容。S-unno现在已经支持各种主流类型的手机。

英文介绍：

  S-unno, from Spice i2i, is a mobile application that allows users to make calls to anyone in the world at low cost rates, regardless of whether they are at home, work or travelling, right off their mobile phone. It empowers the users with true mobility and economical communication, without having to subscribe to costly mobile plans.
 
  S-unno works seamlessly on all major platforms and operating systems- Symbian, Windows Mobile, Android, iPhone and even on the iPad, which transforms your tablet into a phone! The app will soon be available on the MTK chipset as well.

Phone calls between S-unno mobile users are FREE and they can save up to 50% on their mobile telephone bills when calling non S-unno users. As a user, you can also transfer funds to another S-unno account and send international SMSs at a fraction of what you would usually pay.