Wi-Fi texting app that uses my number?

Ok so I'm looking for an app that does what Vonage does and let's me send texts using my number but uses the wifis data to send it. I'm NOT LOOKING FOR AN APP THAT REPLACES MY STOCK MESSENGING APP I'm ON THE IPHONE but I only talk to 3 people that have an iPhone I just want an app that sends texts via my number and uses the wifis data is there an app that's free that does this? Please let me know thanks

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