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2. WhatsApp - Wikipedia

   en.wikipedia.org/wiki/WhatsApp

   To cover the cost of sending verification texts to users, WhatsApp was changed from a free service to a paid one. In December 2009, the ability to send photos was added to the iOS version. By early 2011, WhatsApp was one of the top 20 apps in the U.S. Apple App Store. [27]

3. Add or disable 2-step verification for extra security - AOL Help

   help.aol.com/articles/2-step-verification...

   1-800-358-4860. Get live expert help with your AOL needs—from email and passwords, technical questions, mobile email and more. Add or disable 2-step verification for extra security. Add an extra security step to sign into your account with 2-step verification. Find out how to turn on 2-step verification and receive a verification code, and ...

4. Comparison of cross-platform instant messaging clients

   en.wikipedia.org/wiki/Comparison_of_cross...

   A valid phone number or email address is not required for registration & login. However, the mobile app serves as the primary device, due to the end-to-end encryption architecture. [120] Yes No No No Trillian: No Yes No No Yes Viber: Phone number No No No No WeChat: Phone number or QQ number No No No No No WhatsApp: Phone number No Yes No No No ...

5. Signal (software) - Wikipedia

   en.wikipedia.org/wiki/Signal_(software)

   The number does not have to be the same as on the device's SIM card; it can also be a VoIP number [139] or a landline as long as the user can receive the verification code and have a separate device to set up the software. A number can only be registered on one mobile device at a time. [141] Account registration requires an iOS or Android device.

6. Timeline of WhatsApp - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_WhatsApp

   Timeline of WhatsApp. The following is a timeline of WhatsApp, a proprietary cross-platform, encrypted, instant messaging client for smartphones. [1] Jan Koum incorporates WhatsApp in USA. [2] WhatsApp 2.0 is released on the App Store for the iPhone. [3]

7. Telephone number verification - Wikipedia

   en.wikipedia.org/wiki/Telephone_number_verification

   Telephone number verification. Telephone number verification (or validation) services are online services used to establish whether a given telephone number is in service. They may include a form of Turing test to further determine if a human answers or answering equipment such as a modem, fax, voice mMail or answering machine.

8. Telephone numbers in Colombia - Wikipedia

   en.wikipedia.org/wiki/Telephone_numbers_in_colombia

   01-800 -XXX-XXXX [3] Before 2002, the format was 9800 -XXXXXX. When the current format was adopted in that year, existing toll-free numbers were given the format 01-800-0 XX-XXXX. These numbers were advertised with the grouping 01-8000 -XX-XXX, leading many people to erroneously believe that the general prefix for toll-free numbers is 01-8000.

9. Verification and validation - Wikipedia

   en.wikipedia.org/wiki/Verification_and_validation

   Verification and validation. Verification and validation (also abbreviated as V&V) are independent procedures that are used together for checking that a product, service, or system meets requirements and specifications and that it fulfills its intended purpose. [1] These are critical components of a quality management system such as ISO 9000.