I like that it is easy for me as developer, but also very simple in use by end users who are not developers! It has been used at my work with great success so far!! The only thing about this service was when we had issues sending out mass texts (more than 100), they didn't always respond quickly or help us solve our issue immediately - which can be frustrating if you're trying to get your message across right away. We needed something quick & cheap because of budget constraints, however were able to find another solution using Google Apps instead after realizing how much cheaper their plan would have costed without any additional features provided from smsapi.com.
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