Globalstar Sat-Fi User Manual page 31

Step 4 To increase the size limit for an outbound message before a
warning message will be displayed, select Warn on outbound
message drop-down arrow and select the desired size.
Step 5 When finished changing the Inbound and Outbound message
sizes, select Save.
NOTE: The size adjustment will occur on the next data connection and
you will receive a confirmation email on the next Sat-Fi satellite
connection.
Sat-Fi App User Guide for Android v5 Page 28