Cannot do a group text with samsung devices.

Example, when I create a group text with one samsung user and iphone users (one iphone5s and one iphone6). They all get the group text and I never receive their replies but the other iphone users get the message from the samsung. I'm able to text each one of them individually. I can also do a group text with the two iphone users. They get my texts and I get their replies.

It looks like a setting on my phone or something. I was able to do a group text with samsung people until this morning. Frustrated.

Yes. I know. Imessage only go from iphone to iphone. With all the other devices it goes out as text message.

I even shut off imessage and did the group text and everyone get the text and everyone reply and everyon get the texts but I don't get texts. I think it's my phone or the text message on my phone. I'm going to reset it to factory settings and see before I go and see ATT.