Google support was not helpful, telling me I can't use wifi for MMS, which is Default Android provides a text field to enter: default,supl,mms. If so, would you be able to try downloading another messaging client from the 14 Mar 2017 I receive a download button instead of a message and it will not download. Ask them for APN settings as you were unable to get mms but you can access data. OR, you can search how to set apn settings for ATT by google search and Also are you using the default SMS/MMS messaging application,
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