I read iphone 6 and 6s have issues with texto. I reset network, shut the phone, deleted most of all my texto. I also realized that blue is imessage and green is regular texto. I also have this issue with Rogers SIM card - and I thought it was Roger's bad services. I have this issue with Koodo SIM card. It seems I have covered all the troubleshooting. I have no trouble sending/receiving texto to people who have a mobile - not iphone. So I've turned off the imessage in settings. This works, I can texto. However, I still can't receive texto. Because I have my Mac laptop linked to my iphone, I received notification on my Mac laptop that I have received a texto. But still, on my iphone, it does not show that I have a texto. The good news is that if I have wifi or if I have a data plan, and the "on" for imessage in settings, I can receive all messages, blue and green. But now I am off data, and not always on wifi. I have a wonderful economical basic plan with unlimited texto + $5 USA texto add-on. But I can't use texto. Unless I toggle "off"imessage to send, and back "on"imessage to receive. Anyone has ideas on this - iphone6 troubleshooting. While trouble shooting, I find I cannot get my iMesssge activated.