Is texting free if your on Wi-Fi? (Iphone5)?

I used to have an iPhone 4 and my mom blocked text cause I texted like 100$ a day, but then a year later, I got an iPhone 5 (same phone number, just different phone) and I could text! I started texting a couple of my friends and deleting the messages so my mom won't see. I'm always on wife and my phone is AT&T. Is it free?

Yeah just make sure your data is off and just use Wi-Fi

My what?

I have no clue don't have iPhone.sorry

If it's green it's regular text messages. If blue it's going through Wi-Fi. And even if you delete the texts they will still show up on your bill.

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