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Cell phone accessories come in a wide variety--you can find faceplate covers, hands-free microphones and earphones, batteries, belt clips, and more. Faceplates are a great way to showcase your individuality, and they also make great gifts. For phones that don't work with removable faceplates, look for belt clips and holsters to make life on the go easier.
It's also a good idea to keep spare batteries on hand. If you're on a long business trip, the last thing you want is for your main mode of communication to become unusable. Keeping a spare battery in your car is a good idea for road trips, too. You never know when you'll need to make a call!
Cables and cases can also be quite handy. It's easy to damage the LCD screen of a phone--all it takes is a little pressure, and you might burst the cells in the screen. A case will keep your phone protected and safe from harmful things like dust as well. Extra cables and chargers are something everyone should have; keep one in the car, one in your purse or briefcase, and one at home.
If you have the Treo 650 or another Bluetooth-enabled cell phone, you can purchase a number of accessories to make your phone easier to operate. Bluetooth wireless technology has revolutionized the cell phone experience. It's relatively inexpensive, it eliminates the need for a briefcase full of computer cables, and it lets your device connect without any user input. Bluetooth works by using short-range radio waves that are the same frequency as the ones used by baby monitors and similar electronic devices.