Wondering this myself (Samsung problem) as I can send pics to other iPhone users no problem ( some Verizon, some Sprint and some AT&T). While I first thought it to be an IPhone vs android issue, I’ve now learned that those I’m not able to send pics/mms messages to (WiFi on or off, doesn’t matter) happen to all have Samsung phones. I used to be able to send to them, but it stopped about a year ago... possibly after an update, but not certain; just know that I could and now I can’t. Very frustrating!
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