MyFaves plan by T-Mobile is ingenious. I only have four or five people I call on a regular basis, and they are all family members and my girlfriend. T-Mobile's plan will give a five people each month to be able to call with unlimited minutes. That means I can NEVER go over my minutes. I don't ever have to worry about talking for too long or worry about my minutes.
This means that I have 300 minutes to spend on everyone else I talked to. I generally like to keep my conversations short so I always have plenty left over.
Every 30 days, you can choose a new fave. I never change mine so I have the option to change a fave whenever there is a phone number change.
I really like plan because it gives you so much flexibility. This plan is perfect for someone who isn't a big time talker on the phone. With this plan, say good bye to worrying about your minutes.