Part two of features you may want to consider when buying a new phone:

Push to talk
This is like a walkie-talkie feature that is cool for business folks or those who need constant contact with specific people. The best thing about this is that you don�t need a cell signal to use and therefore no usage of standard minutes.

Speaker phone
Again, for the uber mobile people who drive, type on the computer, take down notes, etc. etc while they talk on their phones. There are units available with full-duplex speakerphones and others that support conference calling.