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What are VoIP, Callthrough and Callback anyway, and how can those services be used for making cheap international phone calls?

Here, we have compiled a list of explanations of various terms that describe how our service works:

  1. Call-by-Call
  2. Calling Card
  3. Callback
  4. Callthrough
  5. Fritz!Box
  6. NGN
  7. Provider
  8. Realtone
  9. Roaming fees
  10. Smartphone
  11. VoIP (Voice over IP)