Cell phone messaging isn't limited to picture messaging or getting cell phone text messages. Did you know you can set up your cell phone to receive instant messages? Many cell phone providers let you configure your phone to get instant messages from Yahoo! Messenger, AOL Instant Messaging or MSN Messenger communities.
Go to your cell phone's messaging menu and activate the Mobile IM feature. There may be a menu called "Get New Mobile", select that and select IM from the options list. Now you will receive text messages from the IM network of your choice. Be sure you understand your cell phone provider's policy on phone text messages and whether IM is charged in the same way as text messages.