How much can I save? $15 a month or more.

6. Switch carriers: AT&T, Sprint, T-Mobile, and Verizon Wireless are the big four in cell phone service, but they're hardly your only options.

Signing up with a smaller carrier, like Boost Mobile or US Cellular, can cut your monthly cost significantly.

How much can I save? Boost Mobile offers an unlimited Android Plan for $55 per month, and an unlimited BlackBerry Plan for $60. (Both of these plans cover unlimited nationwide talk, text, Web access, 411 service, instant messaging, and email.)