GLOVE COMPARTMENT You need a phone in your car or handbag for emergencies but probably won't use it much.
Monthly plans start at $20, but if you use the phone very infrequently, it may be cheaper to buy prepaid calling cards. The best deals: AT&T Wireless's $10 card, good for 45 days, and Cingular's $20 card, with a shelf life of 90 days. Either way the cost works out to $6.70 a month.
SOCIAL BUTTERFLY Your cell phone is your lifeblood; you can't live without those night and weekend minutes.
At AT&T Wireless, Cingular and Sprint PCS, $50 is the going...