My partner and I both have Samsung Galaxy S7 phones on the Sprint network and have been dealing with this issue with our home Comcast/Xfinity Wifi since early February 2020. Our phones consistently sent MMS (group texts or photos, etc.) over wifi with no problem anywhere but at home or work, where Xfinity wifi is in place. At home and at work on Xfinity wifi, our MMS would either consistently fail or send after an extensive delay (usually the former). At a loss as to the source of the issue, I have been in touch with Xfinity, Sprint, and Samsung multiple times over the last few months, none of which can provide any support or resolution other than to point fingers and to tell me that we shouldn't be able to send MMS over wifi in the first place, only over our mobile network (e.g. LTE, 4G, etc.), which is obviously not accurate as we did not have this issue until the recent Android update this winter. I discovered this thread last week as part of my research in response to this ongoing frustration, which has only increased due to our remote work situation. We purchased our own separate router and modem and installed them this evening, replacing Xfinity's combined modem/router situation. It's like magic; our MMS send instantly now with no issues. Xfinity needs to step up and get this issue with its hardware resolved.
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