We are the creator of SMS-Magic Application on SFDC platform and InTxtr - Android App for SMS.
If you are Salesforce Customer, SMS-Magic app lets you interact with your contacts/leads using SMS. It helps you in your customer service, Marketing efforts. Its not just limited to contact or leads, It supports other objects too. You can use our App to build it yourself or take help of implementation partners.
SMS-Magic has built great global network to ensure global reach. Its not yet another SMS bulk messaging solution. You need to try it to understand impact it can create in improving your customer experience.
We are putting great efforts and energy to make a world-class product. Feel free to give us your feedback.