One-the text messaging system that came with my phone. I only text. I have a couple installed, and I talk to my family on one and friends on the other. Just iMessage, Facebook Messenger, Snapchat and WhatsApp. Let's see I use WhatsApp, Facebook Messenger, WeChat, SnapChat, Google Hangouts, Skype, iMessage, and Tango. Oh, and I still send text messages if (heaven forbid!) there's no internet connection! ▶ Next Question ◀