Originally Posted by
Blues Fan Tried both. Maybe it is wifi but I've sent text images many times before on my wifi. When I'm at home wifi calling is always on. Been that way last couple years. It's just this one person though I wonder if it's their phone.
Have you tried looking in the stock messaging app to see if you have any 'missing' texts there? It might be the RCS or 'Enhanced Messaging'. Whenever I have that enabled, 3rd party apps that can't access RCS (or so they claim) ended up missing texts and MMS from other RCS-enabled users. I turned that off and the issue went away. T-Mobile, unfortunately, doesn't let you disable it anymore so I have to work around it with my contacts. I don't think you can turn it off on the S8, but maybe your friend can turn it off on theirs.