After making this change I was able to send 1 text picture to a Verizon user, so I thought PROBLEM SOLVED, YAY!! But hopes were dashed when I tried 3 more times that same day to send different pictures to this same Verizon user, and got nothing but MMS spinner for about 10 minutes, back of phone got hot, and burned up about 25% of battery, THEN phone dings, MMS red exclamation point appears in lower left of photo text - Sending Failed, pooh!!! So, maybe AT&T just limits me to one photo text a day, week, or month?!?!? NOT suggested or recommended by AT&T), they were: CHANGE both 'APN protocol' and 'APN roaming protocol' FROM: IPv4 TO: IPv4/IPv6.

Yesterday, I made some MINOR Changes to my APN settings ( I STILL cannot send pictures via text to non-AT&T phones, H E L P !!!! I then clicked on 'Device Support' and was directed to a page with nothing on it but headers and footers, locked-up! I didn't waste my time calling the 800 number because I had already done that several times in the past. While there I also tried going to 'Troubleshoot & Resolve to fix internet issues,' after logging into 'MyAT&T,' but my Samsung Galaxy Note 5 (SM-N930V) was not found, in devices. While following the link you gave me in the above note, I did recheck all APN settings to be SURE they were all put in correctly, they ARE. Also, the SIM card is from, and was installed by, the AT&T salesperson at an AT&T Store on 3/11, but I DID CHECK the SIM Card numbers and the digits are correct to work on the current AT&T system. This finally got my Mobile Data to work, after I had been struggling since 3/11. I added the correct APN settings back on after calling AT&T 611 Tech help line.

Verizon message app download photos