Kik Messenger You'll get a kick out Kik Messenger. Similar to WhatsApp, Kik lets you send and receive unlimited messages, but at no additional cost. You can see when someone's read your message and know when they're about to type. Like other messaging services, Kik enables photo and video sharing. But Kik is not for kids. You must be at least 17 years old to download it. As far as privacy goes, Kik does not require you to reveal your phone number. These days, it's easy to find social media profiles by syncing your address book. But it can be nice to keep your social media profiles hidden from new acquaintances. Next time a guy asks for your number at a bar, give him your Kik. He won't know your last name...until you want him to. This free app is compatible with iPhone, iPod touch, and iPad, but requires iOS 4.3 or later. It is also available for Android.