I use Skype for Ipad to make telephone calls, just download from apple App Store sign up put some money into the account. I telephone land lines and mobiles (which is cheaper than normal way) I have used it from UK to Australia to land lines and mobiles, USA to UK even send Texts to both from Skype , if you have a hotmail email account and sign in at the bottom of the sign in page it will open up all your
contacts as well.
You can even use it to pay for Internet access if for instance you are at an airport and your 1/2hour is up, if you forget to log off it will log you off after1/2hour unless you click for more time. This is another app called Skype wifi