What are some good apps like Kik?

Kik won't work for some reason on my friends iPhone. She lives over seas so we can't text. Anyone know some really good similar apps to Kik?

Viber is a free text and calling app. And line works too. I recommend viber I'm in Canada and use it to call and text Australia alot. You just need wifi.

Text now maybe? It's texting but over a free app. You can also call her that way