Why is my phone not allowing my text messages sent to others to send I have Boost Mobile

[AC Question]

Today my phone started not allowing my text messages to send .. I don't understand what the problem is I have Boost Mobile

 

[Crashdamage]

Are they plain text SMS (no emoji or photos and to only one person) or are they MMS (with emoji or photos or to more than one person)?

Try deleting unsent messages. Then go to:
Settings > Apps > Tap on your message app > Clear cache.

That's worked for me.

Android since v1.0. Linux user since 2001.