Look at your cell phone bills from the past few months. How much of what you're paying for do you actually use? Plug your bill information (usage, phone type, and ideal plan) into comparison websites like Whistleout and MyRatePlan to compare suggested plans from your own phone ompany and others. Look for plans that offer value on the services and data you truly need (if you never use up your monthly cellular data because you're always on wifi, for example, don't pay extra for a plan with unlimited data).
You can even bring your existing phone and number with you when you switch plans, thanks to a new government regulation. Make sure you're in good standing (no unpaid bills) and that your phone is completely paid off, then ask your carrier to unlock your phone. FYI: If you got your phone for a discount when you signed a new contract, you’ll need to wait until the end of the contract term to unlock your phone.
Source: Money Magazine