Wise question. I wish I had asked it before leaving my phone and two years worth of numbers in a taxi. Fortunately, backup systems abound. If you go through cellphones like toilet paper, try the Universal Pro kit ($80; datapilot.com). It includes cables that let you transfer data to your computer from just about any phone, and it syncs with Microsoft Outlook.
If you are the owner of a Nokia then you can back up the contents of your phone on to a PC using Nokia's PC Suite software. The phone can be connected to the PC via a cable usually available specific to your model for less that $10/- or via blue tooth if you have a blue tooth set. Additionally you can also send and read your text messages when your phone is connected on to the PC without looking at the phone.
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