Huh, is that what it was... I had a Windows Phone 2012-2013 and I think I signed up for WhatsApp on it and I remember chatting with a friend on it and he was talking about the $1 per year thing and I went to check, and it said I have lifetime and I was confused how I ended up with that, but was using it so lightly that I didn't bother to look into why. I figured maybe there was a promotion the day I signed up or something.