Official comment
You can have prospects send an SMS to your ONTRAPORT SMS number to opt in. The SMS message must have all the data on one line with elements separated by a space (and not on a separate line).
The accepted formats are:
1. Email address. Example: bob@bob.com
2. Firstname Email. Example: Bob bob@bob.com
3. Firstname Lastname Email. Example: Bob Smith bob@bob.com
see details at http://support.ontraport.com/entries/...
You can also have an opt in form with the SMS number field for the contacts to opt in using the form.
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