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A problem with the 1571 Text Alerts system that was not stated on BT's website as of 7 June 2007 is that if a mobile phone number is transferred from another provider to either Virgin or T-mobile, the alert system will not work; phone messages will be stored, but text message alerts will not be sent [citation needed].
Some cordless phones formerly advertised as 5.8 GHz actually transmit from base to phone on 5.8 GHz and transmit from phone to base on 2.4 GHz or 900 MHz, to conserve battery life. The 1.9 GHz band is used by the DECT 6.0 phone standard and is considered more secure than the other shared frequencies.
ringer equivalency number SMS: Short Message Service (i.e. text messages) SF: Single Frequency supervision tone : US SIP: Session Initiation Protocol: US SP Lock: Unlocking: UK SS7: Signaling System 7 STD: Subscriber trunk dialling: UK and India T-CXR: T-carrier (e.g. T-1) US TAPI: Telephony Application Programming Interface TR: Tip and ring ...
As demand for telephones grew, more telephone numbers were required. This would often see an exchange with existing three-digit numbers open one or more new ranges with four-digit local numbers (e.g. 5000-6999), and exchanges with existing four-digit numbers open one or more new ranges with five-digit local numbers (e.g. 60000–69999).
0800 later used for BT Freefone numbers - usage of BT 9-digit 0800 numbers continued after the Big Number Change; all new 0800 allocations have 10 digits and multiple operators now issue 0800 numbers. 01801 — unused; 0801 was Thrapston, Oundle – – Was originally 0085 (OU5) until changed to 0801 in 1968 – numbers were transferred to 0832 ...
A push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to a rotary dial used in earlier telephones.. Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in ...
A mobile phone keypad with Latin and Japanese characters. In the course of telephone history, dials as well as keypads have been associated with various mappings of letters and characters to numbers. The system used in Denmark [failed verification] was different from that used in the UK, which, in turn, was different from the US and Australia. [10]
The Tele. 162 Handset Micro Telephone, was the first UK phone to incorporate the transmitter and receiver into a single unit, 'The Handset', which had not been used on telephones in the UK since the very early metal and wood cased models, and the BPO preference for a separate transmitter and Bell receiver, as on the Tele. 150 and Tele. 121.
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