Estimate your minute usage. If you're a frequent cell phone user, you might save money by choosing a prepaid plan that allows unlimited calls, texts and data for a set monthly fee. Less frequent cell phone users might be better served by plans that let you buy time by the minute, and that offer long expiration dates (some are as long as one year).
Ask friends and neighbors. Those who live and work in your neighborhood can tell you how frequently they experience outages, busy networks or dropped calls. Once you gauge satisfaction, check carriers' websites for promotions, shop their retail stores and call them to see where you can get the best deal.
Consult sites such as CellReception.com and DeadCellZones.com. CellReception.com lets you search for service and cell towers by zip code. You can also read subscriber comments for specific areas, down to particular cross streets in your neighborhood. DeadCellZones.com has a complaint database and a listing of dead spots in metropolitan areas.
If you travel frequently, be sure to choose a wireless carrier that lets prepaid customers roam. Most prepaid wireless carriers let you make calls when you're outside their area, but a few charge roaming fees, which may become an issue in rural areas. Some carriers don't allow roaming at all.
Check the terms, since no two plans are alike. Some require monthly or daily usage fees, and minutes expire after a certain period of time, from 30 to 365 days. Many plans let you roll over minutes by adding funds before existing minutes expire (topping off).
Check for free calls. Some carriers offer unlimited calls between you and another subscriber using the same carrier. Verizon's 10-cent pay-as-you-go plan, for example, has a $1 access charge on days you make calls, but all calls to other Verizon subscribers are free.
Read the fine print on unlimited prepaid plans. For example, data might be unlimited, but go over a certain amount of usage and your 4G/LTE speeds will be reduced to 3G or even 2G.
Extra services can add up. Most prepaid plans don't charge anything extra for nationwide long distance, roaming, voice mail or caller ID. However, many do charge extra for data access, international long distance, text, and picture and video messages (although unlimited prepaid plans often include this) as well as games, music or ringtones.