This is an archive article published on May 5, 2014
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LG L90 Dual review: There is more to this phone than the knocking on heaven’s door code

The L90 is powered by the latest Android OS, the 4.4 KitKat and is in perfect synch with the phone’s hardware

Written by: Leela Prasad
4 min readMay 6, 2014 06:03 PM IST First published on: May 5, 2014 at 06:02 PM IST
The LG L90 is priced at Rs 17,499 The LG L90 is priced at Rs 17,499

The knock code has for long been used by prisoners to communicate with each other by producing a series of tap sounds. Alphabets, with the exception of K, are visualised in a 5×5 grid, and each letter is represented by two taps. The first tap signifies the row and the second tap tells the column in which the letter is in the grid. Prison authorities couldn’t decipher the code due to the incessant chatter of prisoners using prison walls, bars etc to tap coded messages. When held in isolation this was perhaps the only way that a prisoner could talk to other inmates.

Decades later, Korean electronics giant LG has patented the Knock Code and introduced a striped down version of it in its new entrant to the L Series Collection, the L90. LG in its press release claimed it to be the “most secure pattern unlocking mechanism”. And we put that to the test.

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