Will subscribers get multiple messages if they are opted into more than one of my distribution lists?
No, the system will recognize if the same contact has been added to multiple distribution lists. If you send a message to multiple lists that contain repeat contacts, those subscribers will only receive one message.
Why are some of my messages failing?
Failed messages may occur due to the following reasons:
The text message was sent to a landline, not a mobile number. In some instances, consumers sign up for distribution lists with landline numbers. In order to minimize having landlines in your distribution lists, it is recommended that you use the Filter Landlines feature, which can be accessed under the "Manage Contacts" section.
Carriers are blocking third-party messages from being sent to the phone number. This is a rare issue, but to help resolve this problem, the contact must communicate with their phone carrier and request to allow third party messaging.
Invalid mobile numbers
Why is there a difference in cost between SMS and MMS?
The cost difference is due to differences in the file sizes being sent. A regular SMS text using simple plain text up to 160 characters, will cost 1 text credit per mobile number. An MMS text, which includes long text messages (160+ characters), pictures, or videos, will cost 6 text credits per mobile number.
Please note - not all US carriers or mobile devices support MMS.