mysms
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mysms is a SMS application for smartphones running Android and iOS. It is the first cloud-based messaging system and enables users to:

replace their standard SMS app on their device
full inbox & adress book synchronization across devices
send & receive SMS & Push Notifications comfortably across multiple devices (smartphone, PC, tablet, iTouch,…)
free messaging between mysms users
no additional phone number required

mysms is available worldwide and available in the Android Market, Apple App Store, Getjar and the Chrome Web Store.