Whatsapp moves to yearly subscription payment, app now free to download
Source click me

cost me 69p subscription and I paid by paypal a couple of months ago

iv installed it on two phones over the past 6mths and not been charged but it does say as of next year it will be 69p a year

Viber is still free as far as I know. Same as Whats App except you can call as well

I had it on my phone free for over 2 years so I suppose that's why I now pay 69p a year!