It's not a TXT with a picture attached it's a MMS / PXT so requires mobile data to be enabled and that is why you get that message advising mobile data is disabled
You dont need mobile data on your account to send it, but you do need to have it enabled. it connects to your providers MMS servers and sends the message. Its also very overpriced if you're going to do it frequently compared to just getting a data pack (of any size).
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