There are a few reasons why your Call Loop account may have been suspended:
1) Your Trial Has Lapsed
If you don't add credits or subscribe to a monthly plan before the 14-day trial is over, your account will be suspended. If you have purchased a Keyword, you will still need to add message credits to your account, to stop it from being suspended.
If your trial has lapsed, but you would like an extension, please contact support.
2) International Account
If you are detected to be an International customer, your account will also be suspended. Call Loop SMS is currently only available in the USA, with Voice Broadcasts and Ringless Voice Mail available in Canada.
If you feel your account has been suspended in error, please contact support.