AKU - Adaptation Kit Update: they usually patch up existing bugs and enable several new features. Each newly released AKU pack retains fixes found in previous versions of AKU CID lock (aka vendor lock): put on your device by the manufacturer to prevent installation of a ROM not released by them ESN - Electronic Serial Number unique to your phone (usually in hexadecimal or decimal) MMS - Multimedia Messaging Service (text messaging with pictures) MSL - Master Security Lock (the six digit code needed to program your phone) PRI - Preferred Radio Instructions (what does this do?) PRL - Preferred Roaming List (tells your cellphone whose towers to use when roaming) RIL - Radio Interface Layer RUU - ROM Upgrade Utility: Its the s/w used on your PC to do a ROM upgrade for your PPC IPL - Initial Program Loader: Its the bootloader for PPC. It boots up SPL. SMS - Short Messaging Service (text messaging) SPL - Secondary Program Loader: Loads the actual OS. WWE Edition - World Wide English Edition XIP - Execute-in-Place UC - User Customization click here
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