Here are the Top Most Useful Accessories, according to your About.com guide to cell phones.
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1. CCM Navigator car kit
When driving, it's safer to use your cell phone with a hands-free speakerphone system such as the CCM Navigator, that plugs in your cigarette lighter outlet. Note that your phone may already include a speakerphone so check your owner's manual first. As an alternative, you may want to use an earset but I find the wires to be annoying when driving. New bluetooth headsets available only with some phones are starting to emerge and are therefore much more convenient.
2. Data cable
A data cable establishes a link between your computer and your cell phone. It can be used to: connect to the Internet wirelessly using your laptop; transfer ringtones and graphics to your phone (provided your phone allows that); transfer your photos from your phone to your computer (for camera phones, of course). Not all these options are available, even if you buy a data cable. Some manufacturers block pictures transfer to force you to use your provider's paid "send" option.3. Cell phone case
Cell phones have a tough life, being carried around, often dropped and use in rainy conditions, so a leather case is a good protection if your phone is not one of the rare "rugged" models. When shopping for that accessory, make sure that it is easy to remove and that it has an opening at the bottom to plug the charger.