I'll admit that I don't make a ton of calls on my mobile phone, and generally don't worry about how many minutes I'm using. However, there are those out there that talk considerably more than I. For those people I give you iCall.

iCall is a useful application which will allow you to instantly switch between VoIP and GSM calls. This means you can sit at home and use your local Wi-Fi network to make calls without using up valuable minutes.

No, the iPhone won't be the first phone to take advantage of this sort of feature, but you can bet that it will be one of the more useful apps. This is said to already have passed the Apple inspection, and should hopefully appear on the App Store sometime after launch.

[via 9to5mac]