Huh? iMessage on iPhones text using wifi... but only to other Apple devices with iMessage turned on. For me, that's a little over 1/2 my friends, so I hardly use much standard SMS texting, mostly iMessage.
I have AT&T, works same with friends on Sprint and Verizon, doesn't matter as long as they have iMessage on. I even use iMessage when I'm in the company truck as it has a Sprint hot-spot.
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