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

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

   We'll send you a text or call you with a new code that needs to be entered at sign-in. The phone number we contact you with may be different each time. Enable 2-step for phone. 1. Sign in to your Account Security page. 2. Next to "2-Step Verification," click Turn on. 3. Select Phone number for your 2-step verification method. 4.

3. 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 .

4. SMS spoofing - Wikipedia

   en.wikipedia.org/wiki/SMS_spoofing

   SMS spoofing. SMS spoofing is a technology which uses the short message service (SMS), available on most mobile phones and personal digital assistants, to set who the message appears to come from by replacing the originating mobile number (Sender ID) with alphanumeric text. Spoofing has both legitimate uses (setting the company name from which ...

5. Signal (messaging app) - Wikipedia

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

   Signal is an encrypted messaging service for instant messaging, voice calls, and video calls. [12] [13] The instant messaging function includes sending text, voice notes, images, videos, and other files. [14] Communication may be one-to-one between users or may involve group messaging. The application uses a centralized computing architecture ...

6. SMS - Wikipedia

   en.wikipedia.org/wiki/SMS

   An SMS message written on a Motorola Razr V3. E.161, a common mobile keypad alphabet layout. Short Message/Messaging Service, commonly abbreviated as SMS, is a text messaging service component of most telephone, Internet and mobile device systems. It uses standardized communication protocols that let mobile devices exchange short text messages.

7. Signalling System No. 7 - Wikipedia

   en.wikipedia.org/wiki/Signalling_System_No._7

   The protocol also performs number translation, local number portability, prepaid billing, Short Message Service (SMS), and other services. The protocol was introduced in the Bell System in the United States by the name Common Channel Interoffice Signaling in the 1970s for signalling between No. 4ESS switch and No. 4A crossbar toll offices.