I don't have the make / model of her phone. I suppose it could be an issue with her phone plan, or settings on her phone. I don't have tons of experience in the wireless telco space and I'm sure I'm abusing terminology.

My Android phone says "SMS" under the "bubble", next to the time, when I send my wife's aunt a message. If I attempt to attach a photo to a message to her (which I've always thought was "MMS") she never receives the photo or any text I send with the photo. Nothing.

re: the identify verification

We had the bank send the message to my wife's phone. She received a message with a link to a website in the native text messaging app on her iPhone. My wife absolutely doesn't have the bank's "app" installed. The website linked in the message used her camera to photograph her aunt's ID and face. I don't know what color the "bubble" was on my wife's iPhone, which I know has some ability to differentiate SMS vs iMessage.

My aunt can receive text messages. She couldn't receive this message. That's what I know.

> multiple telcos have already entirely disabled MMS at the network level.

Really? Are they just presuming all of their customer can use RCS now? Or am I missing something?