Android - SMS Sending Issue
Overview
If you are experiencing problems when sending SMS messages (e.g., they are not sending or an error occurs), enabling the "Force Messages to be sent as MMS" feature may help resolve the issue.
Note: The "Force Messages to be sent as MMS" feature available only in Fully Automatic Sending mode.
1. Access Settings
Navigate to the Settings through the drawer menu.
2. Access Advanced Settings
Scroll down to the bottom of the Settings page.
Tap the button "Show Advanced Settings”.
3. Enable the Feature
Find the Automation / Extension Settings section. Activate the checkbox next to the feature "Force Messages to be sent as MMS".