Since choosing one of the duplicate carrier entries manually, I have had no further problems with SMS.
So, assigning settings automatically when there is a duplicate carrier entry causes random failure. Solution - assign the settings manually by selecting the carrier from the list in Settings.
Since choosing one of the duplicate carrier entries manually, I have had no further problems with SMS.
So, assigning settings automatically when there is a duplicate carrier entry causes random failure. Solution - assign the settings manually by selecting the carrier from the list in Settings.