IM+ : All in One Messenger

  Use IM+ to connect to Beep, MSN/Windows Live®, Facebook®, Skype™, Google Talk™, Yahoo!®, AIM®/iChat, ICQ®, Jabber®, MySpace, Twitter, VKontakte, Mail.Ru Agent and Yandex IM at the same time! Not to mention, it works on ALL popular mobile platforms.
IM+ has the widest selection of unique features that you won't find in any other IM client. Plus, there's no cost per message, so you can send photos, videos, voice msgs, and IM for free and save loads on MMS and SMS with Beep!

Download IM+ for Windos Phone HERE!