- Facebook Messenger
- Google Hangouts
Can/does use your phone number:
Announced, but hasn't shown up yet:
As it turns out, pretty much every remotely social company has a way that people can talk to one another in a phone call-type manner. Many of these apps also let you use video chat, but people have no idea. For instance, you've been able to make phone calls (and recently, video chats) with any of your Facebook contacts on your phone, for such a long time. But I can routinely blow people's minds by telling them that, because approximately nobody* knows about this feature.
Snapchat updated their app yesterday to revamp chat, and added the ability to send video clips or make voice calls to any of your Snapchat contacts who've added you back. But none of the features in the update are actually new capabilities your phone didn't have before, and I'm betting people aren't going to be making use of this feature any more than they did, no matter how good it is.
If I were a gambling man, I'd put money on Snapchat continuing to grow at a rapid pace for quite some time. But people who already have a predefined way of communicating, like my generation and those older than me, won't use Snapchat for voice calls because to us, the way you make a phone call is by calling a phone number.
But the kids, they don't obey these rules. They do whatever their friends are doing, and their friends don't make phone calls to a phone number. That's not cool anymore, at least not until their parents stop doing it.