Our Products


Send texts, photos, audio and video to phone numbers from the web.

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Call & message phone numbers directly using WhatsApp without needing to enter them into your contacts.

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Connect your call directy to someone's voicemail-box & leave a message.

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Send pre-recorded audio messages directly to the voicemails of thousands of phone numbers at one time. Ringless voicemail personalized.

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Share micro-podcasts with your followers and listen to others'. The social network powered by audio.

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Some of our Customers

Who We Are


Founded in 2003, MobileSphere is a pioneer in mobile communication and software. In 2004 The company launched CellularLD -- among the first VoIP over mobile service -- targeting MVNOs and end-users. In 2008 MobileSphere launched slydial, its patented ringless voicemail technology.

Since then we have continued to innovate with our range of patented mobile communications products: slybroadcast, slyText & Slyfone. In 2020, we launched Riffr - a social (micro) podcast platform.

The company's core belief is that software is the engine that will power mobile communication.

Our Values


Our track record of inventions, including patented ringless voicemail, speaks for itself.


We combine out of the box thinking with dedication and hard work to achieve unique results.

User Experience

We deliver best-in-class user experience by listening to & acting on feedback.

Latest News


Riffr, an Audio Social Media Platform, Announces Launch

PR News, March 5 2019


Make-A-Wish© Arizona uses slybroadcast for its fund raising efforts.

Make-A-Wish©, June 22 2018


Rules of Engagement - Shy Dial. Slydial inspired episode.

CBS, November 17 2011