IMPORTANT! ONLY for users of iPhone 4s and higher!
Heyla allows to find people in a nearby proximity and chat with them. If you see somebody and want to talk with this person, but you cannot do it, just turn on the app and wait till this person's profile appears on your screen. You will recognise him or her by the photo. Click on it, and you will also see more photos and some other details. Click on the Chat button and send a message. If he or she replies, you can continue the conversation. Have fun!