My text free app isn't working?

Okay so my iPhone 4s is shutoff, and I only have Wi-Fi on at my house so I can still use the internet on my phone or text other iphones. I downloaded Text NOW, it's blue. And it said that I don't even need Wi-Fi I can text without Wi-Fi for FREE. So I was at my aunts like a week ago, and she doesn't have Wi-Fi so my phone didn't work but I remember that I had that text app so I was able to text ppl, and that was cool. So today I tried texting someone with it and it wouldn't work. I was getting lost and I really needed a way to contact someone I new, so it sucked and I kept wondering why it wasn't working. Any help?

It requires Wi-Fi or 3G/4G. No app can magically give you service.

Text Now is not working, because you do not have access to the internet. No Wi-Fi or no cellular data, no connection to the internet.

When your phone gets shut off, not all things will work on JUST Wi-Fi and nothing will work if there's absolutely no connection to the internet. Maybe in the world of Harry Potter, but not in the real world.

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