No mms on 6.0 or 6.0.1

OK Nexus 5x users. I have searched the web, I've searched the forum, I've searched everywhere I possibly can think of and still can't find a solution. I am on AT&T. I had an iPhone 6s before I bought my Nexus 5x, But from day one I'm not able to receive MMS messages consistently. Everything over 160 characters I don't get. I've tried everything I possibly can find, to no avail. I've messed with APN's, I don't have push bullet installed, I don't have any other text messaging app installed. I still have my iPhone 6s, and I've gone in and disabled face time as well as iMessage and iCloud, so on and so on and so on. I've even tried multiple text messaging apps just to see if that would help. I've installed two different operating systems, however both of them are based on 6.0 .1. For what ever reason no matter what I try no matter what I mess with I can't get any text message that are 161 characters or more to come through. When I reset phone to stock, I can get them to come through for about one minute and then I no longer can get them. I don't install any other apps and they just stop coming through. If I put my Sim card back in the iPhone 6s and make a few texts and then disable iMessage and FaceTime and iCloud again, I can get MMS messages for about one minute and then they stop coming through again. I can send MMS messages just fine I just can't receive them. I see multiple posts on the Internet about this issue with marshmallow. It seems like everybody is able to solve it, "but me". Does anybody on this forum have any idea what I can do to solve this issue?


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