Check out Pure360 – from their website it seems like they have both SMS services and integration with Salesforce. I can’t vouch for their service as I’ve never used it, although I did used to live about two minutes from their offices in Brighton! The other option would be something like Infusionsoft. I’m pretty certain that they have SMS functionality, and would be very surprised if they didn’t integrate with Salesforce.
According to recent research from Radicati Group, worldwide email volume will reach 207 billion messages this year—more than half of those for business. The typical business user receives well over 100 emails each day. Email marketers are challenged not only to make their messages stand out in that deluge, but also to provide relevant, actionable information to targeted recipients.