Not able to send MMS over wifi (T-Mobile)

[Bodestone]

It does suck bt the mms protocol is badly outdated. I am solely in the UK and ran a script on my phone to disable mobile data when on wi-fi and bang. No mms.

MMS relies on carrier credentials and specific port information not provided over wifi.

This was years ago and I stopped using it when they started charging heavily, and justifyably for supporting a badly designed and clunky protocol and infrastructure.

Talks are apparently in progress to redefine the entire sms protocol along the lines of instant messaging to remove the need for 3rd party apps like snapchat to send free pictures but this will take time and obviously meet opposition.

 

[Carrie Greicar]

I may have fixed it on mine. In the developer's options I had keep mobile data turned on for faster switching from wifi to mobile. Well I unchecked that and it appears my texts/mms are now going through when the mobile data is next to nothing.

 

[Dude_7]

I turned on Wi-Fi calling and that fixed it on my Nexus 5X.