If you have an awesome cell phone provider, like US Cellular, and have free incoming minutes, then here's a great way to save those minutes, even when you're calling out!
Get a google voice phone number. It's only by invite right now, so request yours as soon as you can. You can pick from any area code you want, and there are many other benefits of having one. Google is great.
Sign into your google voice account online, and use their "Call" feature. Type in the number you want to call. Google will then dial that number, and CALL YOU to connect you. Catch that?
It's an incoming call. I double-checked this (because it's too amazing to be true when you only have 100 minutes to last two more weeks), by checking my minutes before and after making a phone call this way. No minutes used!
Sweetness.