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2. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_Code

   The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [6] [7] [8] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [9] the pattern of the position detection markers was determined by finding the least-used sequence of ...

3. Wikipedia:WikiProject QRpedia/user guide - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:WikiProject...

   If possible, providing free Wi-Fi hotspots will facilitate more use of the codes, especially in remote or thick-walled buildings with unreliable mobile internet connections. Display the codes where people (including children, and those in wheelchairs) can reach them. The codes should be well lit. Shadow makes it more difficult to scan.

4. WhatsApp - Wikipedia

   en.wikipedia.org/wiki/WhatsApp

   Download QR code; Print/export Download as PDF; Printable version; In other projects Wikimedia Commons; ... WhatsApp was changed from a free service to a paid one. In ...

5. Use WhatsApp to verify your AOL account

   help.aol.com/articles/use-whatsapp-to-verify...

   Try entering your phone number again, and verify it's the correct number and matches the phone number you use for WhatsApp. Check your WhatsApp account phone number. If you have a registered and active WhatsApp account, make sure the phone number you provided matches the phone number listed in your WhatsApp account profile. Open Settings in ...

6. Timeline of WhatsApp - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_WhatsApp

   Download QR code; Print/export ... WhatsApp 2.0 is released on the App Store for the iPhone. [3] 2009: October: ... WhatsApp goes free, with an annual subscription ...

7. What's a six-digit verification code — and why you should ...

   www.aol.com/whats-six-digit-verification-code...

   Never give a verification code to a stranger. No one should ever ask you for a six-digit verification code — not a stranger on social media, not tech support, not even your bank.