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2. Telephone number verification - Wikipedia

   en.wikipedia.org/wiki/Telephone_number_verification

   A JavaScript function can check to see if a phone number is a valid format, i.e., is numeric, starts with a valid set of numbers ("0" for local, or an international dialing prefix followed by a valid country code) and is not too short to be a phone number. At first a JavaScript function is used to clear out any spacer characters.

3. Google Voice - Wikipedia

   en.wikipedia.org/wiki/Google_Voice

   Google provides free PC-to-PC voice calling worldwide. As described above, Google Voice users in many countries may make low-cost calls to international phone numbers, and currently may also make free PC-to-phone calls within the United States and Canada. Vincent Paquet, a co-founder of GrandCentral who became a senior product manager at Google ...

4. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   Yes, plans available with unlimited calls to 20 countries, unlimited int'l texts, int'l roaming [84] [86] [87]? Owned by China Telecom. China Telecom and parent company China Telecommunications Corporation are state-owned (by China). Dual-number activation: U.S. phone number and virtual Chinese local number. [84] China Unicom Cuniq US T-Mobile ...

5. The Benefits of VoIP Phone Systems - AOL

   www.aol.com/benefits-voip-phone-systems...

   Over 30% of U.S. companies use Voice over Internet Protocol (VoIP) phone systems. Many switch from conventional services to realize the benefits of VoIP, including lower costs, operational ...

6. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   The VoIP E911 emergency-calling system associates a physical address with the calling party's telephone number. All VoIP providers that provide access to the public switched telephone network are required to implement E911, a service for which the subscriber may be charged. "VoIP providers may not allow customers to opt-out of 911 service."

7. Why these VoIP services are the best for calling family and ...

   www.aol.com/why-voip-services-best-calling...

   Most VoIP services involve a subscription fee on a rolling basis, but they often end up saving you money in the long term by providing you with free or low-cost calls as part of a bundle deal.