ragiesam29
Maybe just maybe you have not set your APN correctly yet, so here it is.
— On your Android unit Settings, set APN to "mms" first...
1. Settings
2. More
3. Access Point Names
4. If you are previous "wap APN" user, just rename "wap" to "mms".
( Editing "MINTERNET APN" to "mms" is also an option. Just click on the 3 dotted symbol on the upper right, tap on "Reset to Default" and it will go back to its original APN, then rename it to "mms" ).
5. Locate "Authentication Type" tap on its drop down option and choose "PAP or CHAP".
*Also make sure to input the correct handler settings for Sun Cellular.