IMO Beta is a messaging app that you can use on your wireless phone.
Rather than being its own instant messaging app, IMO Beta allows you to send messages through other popular IM platforms. You can talk, chat or send texts. You also can send certain files through the service.
IMO Beta is actually a version of IMO Messenger that is used to test out new features. By having the beta version of the app, you get access to new and updated features before anyone else.
IMO Beta is free to download and easy to use. It has a good interface, and also automatically syncs with your phone's contact list.