@user63J5YhnY6s i dont know if xfinity has this but on stock messaging app can you check the Message Center Number if ever xfinity has it and then check their website if it's the right number? It should start with "+" sign.
Found a solution ....other may want to try with their S 10 . Brief backgound....home has NO cell service ( sits in a mountain valley) For YEARS I had an LG phone with wifi calling through Verizon and it would text ANYTHING instantly through my house wifi and land line. Recently switched to US Cellular and a new Galaxy S 10. After setting up everything correctly I tried texting through my wifi line land . Sometimes they went ...in a few minutes , sometimes not for an hour . Read all these problems online that everyone seems to be having ....changed my messaging app ....even tried the Verizon Message + that worked fine on my old phone and still NOTHING . Finally started digging deeper into my wifi settings on the S 10 . Opened "settings" icon and then clicked on "connections" opened my home wifi connected which I was connected to under current network. There is a little "gear wheel" to the right of my named connection, pressed it to open another "settings" page for my conection . On the bottom of this page is an "Advanced" tab. OPEN IT ! There is a setting called "Metered network" Mine was originally set ( probably from the factory) as "Treat as metered". Open that tab and set it to "Treat as unmetered" , Save and exit !! PROBLEM SOLVED !! Texts ANYTHING now INSTANTLY !!! LOVE this phone ! Was going to hate to have to return it because of the texting issue !
Just bough Samsung S10e (Had an S7 Edge before) Couldn't and still cant send a PDF as a text.
Just now - using suggestions and changing to unmetered on S10e.
WiFi OFF - Won't send.
WiFi On - Won't send
WiFi "Calling" OFF - Won't send.
WiFI "Calling" ON - Won't send.
I'm not terribly techy but would love to have a solution for this. It's frustrating.
@Lithium-AdminPlease pin this as the answer for this problem. This is a very strange problem that seems to have something to do with Samsung and/or carriers pushing a security update, enabling Metered Connection on home wifi.
I have a full Unifi setup at home that is way underloaded and my wife nor I on Samsung S10's, all of a sudden recently could not send a picture through text to each other. My wife was ready to sell her phone and go back to her iPhone.
This is poor management on Samsungs part. Push a request to enable, but force enable? Unsat.
Omg! I think this is going to work! I've been searching for a fix for over a year. It has happened off & on with 4 different Samsung phones. Mostly with AT&T SIMs.
I used to think it was due to wifi calling but recently pics will only download when wifi is off (& wifi calling left on). If this fix lasts, I'm going to give you credit & post your fix all over. So much appreciate your post!
Update (half a day later). I'm sad to report that this fix did not end up working. I was using Google Android Messages and the first 2 sets of pictures came right in but after that, backStock Samsung Messages app and it was working for one picture download and then now, it once again kept trying to download, spinning & spinning. Closed the Messages app, reopened and still wouldn't download. Turned Wifi off and the picture downloaded immediately. This problem is on an Unlocked Glaxy Z Fold 2 with AT&T but I've had this issue on 2 S10e's & Note 10+.
I'm having the same problem. AT&T service, Galaxy 20 FE, brand new phone. Messages come in but won't download if I'm on WiFi. Turn it off, click download and it works. Tried changing to unmetered, called into AT&T support a dozen times, nothing is working.