I used iMessage to text my sister in VN.  She used iMessage too.  AT

I used iMessage to text my sister oversea.  She used iMessage too.  My service ATT said they will charge for my text?  Is that right?

No, not per text.  iMessage does not use your carriers text plan as long as both parties are using iMessage.  If you're not connected to wifi, iMessage will use your cellular data plan, with each text being very, very small... probably less than 2kB.

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