Trouble texting pictures to non-AT&T devices, post switch from Verizon...., WHY?
Switched from Verizon with Samsung Galaxy Note 5 (SM-N930V), using Samsung Messages that came on phone for texting. I cannot text pics to non-AT&T users. I can text pictures to other AT&T users, but CANNOT text pictures to Verizon, and assume other, provider users. When trying to send I get a little note on bottom left of text that says "MMS" with a little spinner spinning for about 10 minutes. Then phone dings and says Sending Failed, Message Failed. When I look at failed message a red exclamation point is in bottom left where MMS and spinner was. I have tried: Data on , with Wi-fi off, Data on with Wi-fi on, Wi-fi only on Data off (this works to send to other AT&T users). Same results, sending for 10 min. or so, then FAILS. I have chatted and called AT&T many times, no help! I cannot go back to AT&T Store as closed for corona virus.
I have been working on this for about 4 weeks now (since 3/11/2020 PM. PLEASE HELP!!