Now this tip will work with any decent phone but it takes an iPhone
user to spot its value and tip you to a bargain. iPhone users are the
guys who are always into the best deals on the planet, that is why
they have an iPhone. ;>)

TIP: dukaDial lets you make calls to North America for absolutely
free. All you need to do is sign up, enter the number you want to
dial, enter your own phone or mobile number and dial. This will create
a phone call between the 2 numbers without any charges to either
party. Indeed, a dream come true.

No VoIP involved.

See More: iPhone Tip: Make Free Phone Calls to North America!!