Same thing for me on Sprint. I can't send MMS. Just trys and says unable to send with option to retry. I've tried uninstall and reinstall. I've tried clearing app data with no luck. I have noticed that it forces mobile data to send even when on wifi. I use Textra and it sends both sms/mms over wifi. I hope this issue gets fixed because I'd like to use Hangouts for everything, but if I can't use mms then I can't use it as a sms/mms replacement. Back to Textra I go for now.
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