Call free (or really cheap) to many international destinations. (callcheap.de)
Revocation Policy
The Customer confirms regarding the services provided by callcheap (e.g. pay-as-yo-go, call-by-call, call-through, flatrate-, unlimited- or included-minutes packages) that the Customer forfeits the right of revocation at the point in time of first use (pay-as-you-go, call-by-call, call-through) or provisioning (flatrate-, unlimited- or included-minutes packages) of the respective service. Should the Customer decide to not completely or only partially use deposited credit the Customer cannot claim a refund of the remaining credit.