Can't send MMS text on Galaxy phone

[Jeybo]

I recently got a s21 ultra with AT&T service. I am unable to send picture texts via MMS. Any suggestions? 

[usercOpGrJqpKL]

did you do a recent update? my phone 21 ultra is currently updating and I'm scared... updates seem to mess up battery life.. connection and messaging the phone worked perfectly out of the box and I have to send back this one..

[Cyberbuilder]

Make sure your APN settings are set properly.

[rkj]

4888. 4888488 I don't remember

[rkj]

my :mobile_phone: I don't know what the heck I'm doing

[user751201tmO21]

Using "which" messaging app?

[Jeybo]

message+, samsung message, google messaging. I have tried all those

[Jeybo]

I have used message+, samsung message and google messaging. It doesn't matter which message app I try. I have had phone and sim card replaced. New one is doing same as old. one.

[KCrosby]

did you check your settings within the messaging app to see if the MMS limit is lower than your picture size?

[Jeybo]

I can send thru FB messenger.