Levels of Functionality

Low Tier: phones generally have a low-resolution camera, low resolutions displays and may not have Bluetooth, they also generally lack such features as MP3 players, email and expandable memory.

Mid Tier: phones have medium-resolution camera, Advanced Bluetooth, and Internet access capability, but lack E-mail access.

High Tier: phones have advanced features such as 2 MP or above camera, Advanced Bluetooth, expandable memory, email access, touchscreen, and internet access capability.