My service provider for my iPhone is Rogers, here in Canada. A few days ago, they released a new app for the iPad that enables your iPad to make and receive calls on your iPad using my actual cell phone number. And it's free! You can make calls for free all over Canada without using your minutes plan or having additional charges.
When someone calls me on my cell phone number, both my iPhone and my iPad are ringing. Basically, they turned my iPad 1 into a "wifi" cell phone.
Basically, it does the same thing as Skype but uses my actual phone number for incoming calls. It works on any ISP, so you can use you iPad anywhere.
I've been using Skype for many years to make long distance calls across Canada. But I won't renew my 30$/year plan this year with this new service. Of course, with Skype, I could call all over America, but there is Google Voice that can do it for free.
So if you are a Rogers customer, and have also a cell phone plan, this app will be great for you.
Note: a Windows/Mac app client is also available for computers...
A happy Rogers customer!