Why can't I send text messages to a certain number?

[AC Question]

EVERYTIME I TRY TO TEXT TO ONE SPECIFIC NUMBER, THEY DO NOT GO THRU. I CAN RECEIVE MESSAGES FROM THAT NUMBER BUT THEY DO NOT RECEIVE WHAT I SEND. The number I am trying to text said that they do not have me blocked. I have a Huawei Pronto LTE phone, THRU STRAIGHT TALK

 

[B. Diddy]

Welcome to Android Central! Have you tried contacting Straight Talk about this? By the way, typing in all caps is considered to be "yelling" on the web, so make sure that CAPS LOCK key is turned off--thanks!