Hi, one of my contacts can't recieve my text messages, I can call this number and they can message me however they can't recieve my messages still, we have spoken on text before but only a few days ago my messages weren't being received on their end, I can send and recieve messages from every other contact and so can the contact I am trying to text. I have been in contact with the phone company twice and they said it should be fine and to contact Apple, please help me, what could be the problem??? Also the recipient is not an apple user.