Zoommitt is a SMS texting solution in iOS & Android apps as well as a web app that allows you to send hundreds of SMS text messages to groups of recipients instantly with powerful features such as: Message scheduling, No limit to message length, Attach images such as coupons, Build groups by exporting contacts from Excel, Text merge sends custom messages to each recipient.
Watch this video to learn more
(Unfortunately app is now off the App Stores)

Zoommitt Mobile App