I am having issues with one of my friends. Frequently, my text messages show up as a green text and do not go through. I message him on Facebook and tell him to send me a text and then it is back to blue and iMessages will go through. It works good for a period of time and then it goes back to green and not going through. Sometimes it only works for a couple of days and sometimes it works for several weeks. I only have this issue with one contact. Does anyone have any idea what is going on? We both have iPhones.
Thanks!