Messaging issues

A

AC Question

I recently had to get rid of my HTCM8 related to messaging issues. Messages either wouldn't send, would send duplicates, or only partially send. Messages received to my phone would either never come through, or they would be mixed with messages that had been received previously. This went on through two different phones. Now I have a brand new Samsung s7 and I'm either not getting messages, or when I send only part of the message is sending. It's not all the time like the HTC was, but this is concerning. AT&T has looked at my account and there appears to be nothing wrong. And another phone on my account has no issues. My phone is important for work, so I need it to work properly. I had none of these issues with iPhone. I haven't used an iPhone since the spring of 2014.