You can access Facebook features using a mobile device like a cell phone in three ways: mobile text messages, mobile uploads and mobile Web browsing. Let's take a look at each of these in turn.
Text messages use a standardized mobile text transfer method called Short Message Service (SMS) or Multimedia Messaging Service (MMS). SMS allows you to send and receive text messages to services like Web sites, voice-mail systems and e-mail servers. An SMS message can only be up to 160 characters long. The MMS standard is an improvement on SMS, with no size limit to messages (though very large messages require an advanced 3G phone network to transfer through the system). Not all phones have SMS or MMS capabilities.