Kik Messenger is one of the first cross platform instant messaging clients and they just performed a significant update. The messenger app is still available for BlackBerry, iPhone, and Android phones for free but they are using new user accounts with this version. When you download this new version it will seem like you have lost your previous Kik contacts but that is just because of the new usernames that they are using. They replaced the hard to remember Kik Codes with usernames. Your current contact list will not appear but as your friends upgrade to the new version you will get a message letting you know ("Your friend _____ has now upgraded…). So eventually you should have the same contact list as before.
The other big change is that they have removed the free SMS capabilities. This is because the app is now available worldwide and they could not offer that service to everybody. Shame but not a deal breaker. The other changes include notification when other users are typing in a chat and fast reliable messaging improvements.