heavenlywild: Telecom has just updated their $19 Value Pack to include free calling between Telecom mobiles until 31 March 2013. Now that's a pretty awesome deal!

What will Vodafone do, if anything?

Not bad, but you do need to check prior to calling whether the number is on the tc network or not. Otherwise you could end up with a big bill. 

you don't get any bills on prepay

No, but you could end up using all your credit if like me you have a lot of credit on your phone.