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iPhone Text Messages do not send
When my iPhone is connected to the T-Mobile 5G Hotspot, I cannot send text messages from the iPhone to non-iPhone users. There is just a “message unable to send” error.
IMessages and Android don't play well with each other.
You might want to go to the Apple forum and see if there's a fix there.
Under messages settings you can enable SMS but check to see if MMS is enabled or not. If it is disabled try enabling MMS first as it is a bit more robust.
I am referring to the messages settings on an iPhone.
