Unlocked Keypad Phones
Cherrie Patete
A substantial part of my job involved using an electromechanical calculator to check figures submitted by various departments. The keyboard layout was identical to present computer layouts as well present digital calculators. Index finger was for the left column, next two for adjacent ones. Thumb did zeros exclusively. I became very fast at this touch based skill, as my eyes were on the numbers on paper (there was no visual feedback - just the numbers that were printing on the tape, but you didn't look at that. Mistakes were extremely rare, and required a redo of the entire document. This was also in the days of rotary phones.
Imagine my shock when reversed digital keys appeared on telephones. My skill was not transferable to them. The decision by Bell Labs, or whomever, to reverse the layout was thoughtless at best, stupid at worst.
"This was due to research conducted by Bell Labs using test subjects unfamiliar with keypads. Comparing various layouts including two-row, two-column, and circular configurations, the study concluded that while there was little difference in speed or accuracy between any of the layouts, the now familiar arrangement with 1 at the top was the most favourably rated."
Push-button or Touch-tone keypad designs are merely based on the Bell's labs research, and I would add it is a logical order when no studies proving the opposite existed at that time. Reading is Top to Bottom, Left to Right for those who designed it (in USA), so it starts 1,2,3 Top...to 7,8,9 Bottom [Total of 9 digits] we have three rows with three digits in each.
Another point: if you take a look at the Rotary-dial phones, notice that they mostly have the Zero as the first digit located bottom middle, so Push-button design kept the zero in the same location as the Rotary-dial design, maybe?
A lot of banks I have dealt with require the customer to enter their customer number, internet banking password (or phone password) and date of birth all via the phone keypad, prior to being connected to a staff member. Each of these individual details are followed by the # symbol.
Key loggers on smartphones do not carry the same risk as key loggers on PCs because of app sandboxing. That's not to say that it's not possible either by rooting the device, persuading the user to install a custom (malicious) keyboard or perhaps even side channel attacks.
Maybe your banks are less secure than mine, but in my experience you can only transfer money to people you have already set up as recipients via the keypad. Adding a new recipient requires a more extended authentication process.
If you are suspicious of your smartphones keypad then you could use a tone dialer. But if you don't trust your smartphones keypad you shouldn't trust its microphone either, or the software between any inputs and the signal out.
A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s that replaced rotary dialing originally developed in electromechanical switching systems.[1] Because of the installed abundance of rotary dial equipment well into the 1990s, many telephone keypads were also designed to produce loop-disconnect pulses electronically, and some could be optionally switched to produce either DTMF or pulses.
The layout of the digit keys is different from that commonly appearing on calculators and numeric keypads. This layout was chosen after extensive human factors testing at Bell Labs.[3][5] At the time (late 1950s), mechanical calculators were not widespread, and few people had experience with them.[6] Indeed, calculators were only just starting to settle on a common layout; a 1955 paper states "Of the several calculating devices we have been able to look at... Two other calculators have keysets resembling [the layout that would become the most common layout].... Most other calculators have their keys reading upward in vertical rows of ten,"[5] while a 1960 paper, just five years later, refers to today's common calculator layout as "the arrangement frequently found in ten-key adding machines".[3] In any case, Bell Labs testing found that the telephone layout with 1, 2, and 3 in the top row, was slightly faster than the calculator layout with them in the bottom row.
In feature phones the letters on the keys are used for text entry tasks such as text messaging, entering names in the phone book, and browsing the web. To compensate for the smaller number of keys, phones used multi-tap and later predictive text processing to speed up the process. Touchscreen phones have made these input methods obsolete, as screens are typically large enough to show as many virtual buttons as necessary for full text entry.
Pressing a single key of a traditional analog telephone keypad produces a telephony signaling event to the remote switching system. For touchtone service, the signal is a dual-tone multi-frequency signaling tone consisting of two simultaneous pure tone sinusoidal frequencies. The row in which the key appears determines the low-frequency component, and the column determines the high-frequency component. For example, pressing key 1 results in a signal composed of tones with frequencies 697 hertz (Hz) and 1209 Hz.
The system used in Denmark[failed verification] was different from that used in the U.K., which was different from the U.S. and Australia.[9] The use of alphanumeric codes for exchanges was abandoned in Europe when international direct dialing was introduced in the 1960s, because, for example, dialing VIC 8900 on a Danish telephone would result in a different number to dialling it on a British telephone. At the same time letters were no longer placed on the dials of new telephones.
Letters did not re-appear on phones in Europe until the introduction of mobile phones, and the layout followed the new international standard ITU E.161/ISO 9995-8. The ITU established an international standard (ITU E.161) in the mid-1990s, and that should be the layout used for any new devices.[10] There is a standard, ETSI ES 202 130, that covers European languages and other languages used in Europe, published by the independent ETSI organisation in 2003[11] and updated in 2007.[12] Work describing some principles of the standard is available.[13]
Since many newer smartphones, such as the Palm Treo and BlackBerry, have full alphanumeric keyboards instead of the traditional telephone keypads, the user must execute additional steps to dial a number containing convenience letters. On certain BlackBerry devices, a user can press the Alt key, followed by the desired letter, and the device will generate the appropriate DTMF tone.[14]
2023 HMD Global. All rights reserved. HMD Global Oy is a licensee of the Nokia brand for phones & tablets. Nokia is a registered trademark of Nokia Corporation. Nokia Corporation is not a manufacturer, importer, distributor or retailer of the Nokia-branded products offered by HMD Global Oy.
currentYear HMD Global. All rights reserved. HMD Global Oy is a licensee of the Nokia brand for phones & tablets. Nokia is a registered trademark of Nokia Corporation. Nokia Corporation is not a manufacturer, importer, distributor or retailer of the Nokia-branded products offered by HMD Global Oy.
radio transmit/emission (e.g. to (try to) connect to mobile network). This doesn't depend on the type of phone (but if it transmit on non standard frequencies), but on the airplane. You should check your airline website, to see if your plane has micro cell for phones (usually it is advertised). Note: you cannot use them below height (from ground) 3000m (10000 feet)
I have a question about letter combinations of a phone keypad key in JavaScript. I wrote a solution using DFS recursion. But it does not work as expected. I am new to JavaScript but similarly written code in Ruby works.
More and more now, there are automated machines that want to call us back, and they want us to enter information via touch tone. I encountered this with Uber recently, when attempting to report an item that was left in the Uber car. Uber's automated machine had to call me back to take more info. However, I didn't have enough time to get to the phone's keypad to enter info in. Then recently, a friend of mine told me of an incident where Apple was calling him back because he was reporting an issue he had with his account, however, again, he was asked to enter in information, but could not get to the keypad quick enough. That is the downside of answering the phone and the phone not being in focus straight away.
Has anyone any solution to the problem? I'm using an iPhone SE2 with the latest iOS update, btw.
And I do have multiple ways to use the keypad, such as using my bt keyboard, or my Orbit reader 20. But, needing to get there quickly after answering the phone, that is another story.
Microorganisms live almost everywhere, they are even present on inanimate objects such as Mobile phones, as a result contaminates our body. The main purpose of this study was tantamount to compare microbial contamination of keypad and touch screen mobile cell phones between hospital and non-hospital staffs. Samples were collected from 456 cell phones of hospital and non-hospital. Microbial swab samples were taken from 1 cm2 of surface from each cell phone, and incubated on Brain Heart Infusion agar media at 37.5 C for 24 h. Isolated microorganisms were grown aerobically on 55% defibrinated Sheep Blood and eosin methylene blue agar media at 37.5 C for 48 h. In present study the antibiotic microorganism-resistant could not be observed. Overall, 456 cell phones were collected: 240 (52.63%) from hospital staff (nurses), 216 (47.36%) from non-hospital staff (health care worker outside the hospital). The result indicates that the bacterial contamination of phones used by all of different investigated groups was lower in touch screen devices than keypad devices and the contamination was found more in hospital staff cellphone than non-hospital staffs cell device. Womans cell also has a few colonies rather than mans cell phones. The dominant microorganisms in the hospital staff were, Enterobacteriaceae, Bacillus species, especially Gram-positive bacteria sporulated and staphylococcal negative coagulase, respectively. Cell phones could be a serious threat to the spread of cross-infection in hospitals, therefore development of hand hygiene and cell phone cleaning guidelines is needed regarding public cell phone use.
e2b47a7662