These service can only return the email-to-SMS gateway addresses for mobile phone numbers, since gateway addresses don't exist for landlines.
In the result file you receive, there's a column called "is_wireless" which indicates whether a phone number belongs to a wireless phone or not. Check and see if the numbers you submitted are landlines.
You may have a formatting error in your file. See topic 6 in this category for file formatting information.
Article ID: 42
Category: Text@ and Carrier247 Services
Rating (Votes): (23)