Why can't I send an mms message under iOS 12?

thersites

    This morning I wanted to send a photo to an appliance repairman -- basically, an mms message since the repairman doesn't have an iPhone -- but it fails every time (I can't receive them, either, although I can receive plain sms messages just fine). In Settings > Messages, "MMS Messaging" is ON (so is "Send as SMS" above it). I've tried deleting Network settings and I've been in touch with T-Mobile tech support about this, to no avail. It doesn't matter whether I'm on Wi-fi or the cellular network.

     

    Are other people having trouble sending mms messages from iPhones to non-iPhones under iOS 12? I confess that I've never tried this before because I almost always send pictures to other iPhone users.

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