What is a good free text message service?

So I prefer texting over calling but my mom doesn't and it makes it very inconvinent to try and get a hold of her, i need a way for her to be able to text me for no charge from an iphone (her phone) to an android phone (my phone)

there are many apps that do pretty much what i want but i don't know the apps on the iphone store so i need help on finding a app that will text me for free(her end i don't care that much if it charges me the same as a normal text)

and it needs to be free to download from the Iphone store.

please give me some ideas and tell me if both of us need the app or anything like that…

The best one is viber. It is totally free to text or other people who also have the viber app. Picture messages are also free. Very easy to use

Use WhatsApp. Its easy to use, so your mom won't have any difficulty using it. But for it to work, the phone needs an active data connection or Wi-Fi.

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