Our developer team has launched the latest version of SMS on Workflow add-on which has taken care of the below-mentioned shortcomings:

  1. When the customer is trying to send SMS in languages other than English(aka Internationalization), the salutations for the name field(eg. Mr, Mrs, Ms) don't get translated. This patch would help us resolve this
  2. The Scheduled workflow batches were facing huge delays. That has been reduced

If you face any of the above issues, please upgrade using the below link.

SMS On workflow 1.22: https://login.salesforce.com/packaging/installPackage.apexp?p0=04t90000000Y2yJ