IPsky United States
- International VoIP Wholesale Provider
- Phone To Phone
- Quintum
- Billing system of own development
Using Voice over Internet Protocol (VoIP) calling applications on your mobile phone can save you money if you make a lot of international calls or travel out of the country often. iPhone users have several options when deciding what app to download.
CIS VoIP Inc.
CIS.VoIP interconnects with carriers worldwide to provide you with the best quality and the most competitive pricings.
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