Hello pinstack family. There's a new chat app for iphone to iphone messaging in the app store called Ping. Unlike the Whatsapp messenger you don't need the person's cell number. All you need is their username. You're always connect no matter what, much like bb messenger. The only thing that I see is missing is that you don't have a formal buddy list, so I would assume if you want to save the usernames you would have to add them to your addressbook. It works great and it does have push notification. Feel free to add me. My username is liliken.