Each time you receive a message, add the mobile number to one of your Contact Groups.
This is great for automatically merging mobile opt in data to an imported data list from a spreadsheet.
To activate select “Add Sender to Group List” on your inbox settings screen. Select the Contact Group to add the sender number for each received message. You can choose to add the received message text itself to a custom field.
Duplicates will be removed automatically for you as the mobile number is copied into your selected group.