You will not be able to make your first free call with Ringo if the rate for the country you are trying to call is more than the free credit that you have received on your signing.
For a handful of destinations, Ringo calling rates are more than what we first provide you with. In most cases, however, you will be able to make a free Ringo call for at least a few minutes with ease.
However, if this issue persists, do write to us at firstname.lastname@example.org and we'll help you out.
For detailed rates, please visit http://ringo.co/rates.html.