What you can do:
1. Register multiple devices
2. Manage SMS campaigns
3. Manage contact books to segregate your customers
4. Construct your system API to integrate with other applications
5. Mobile application will deliver your messages, that is free if you have message bundle from your service provider
Please register on www.smsvolt.com to register your mobile app and start using this service.
Using this service can save up to hundreds of dollar as compared to SMS gateway based SMS campaign services. Just consume what you have and grow your interaction with your customers