Yes, I followed those instructions.I've actually figured out what's going on.The http://mms.msg.eng.t-mobile.com/mms/wapenc URL works over the cellular network - but times out over WiFI.And it's not just my WiFi - try e.g. https://www.isitdownrightnow.com/mms.msg.eng.t-mobile.com.html. So… why is it only working over the cellular network?
I'm having the same problem on a OnePlus 8 phone. I've switched the APN protocol to IPv4, and added “internet+MMS" to APN type - but still cannot send or receive MMS without a cellular network.
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