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    • Cell Phone Frequencies

      Cell Phone Frequencies

      Cell phone frequencies are the frequency ranges within the Ultra High Frequency (UHF) band that are designated for cell phone use. Bluetooth devices, wireless networks, and television signals also use this frequency band. Although cellular phone systems divide cities and geographic areas into smaller cells of coverage, it allows for a fair amount of frequency

    • How to Install Telephone Wires

      How to Install Telephone Wires

      Telephone wires are easy to work with and very safe due to the low voltages involved. The most complex part of installing telephone wires is complying with the defined standards. When installing additional telephone wires into an existing facility, it is usually best to determine which telephone wiring standard is currently in use and conform

    • PCS (Personal Communications Service)

      PCS (Personal Communications Service)

      PCS (Personal Communications Service) is a set of standards. Most PCS standards are based on an existing standard. PCS is little more than the operation of these standards on the frequency bands of 1930-1990MHz for receiving and 1850-1910Mhz for transmitting. PCS StandardBase Standard PCS TDMA IS-136 PCS CDMA IS-95 PCS 1900 GSM PACS PHS cordless

    • Telephone Tone Frequencies

      Telephone Tone Frequencies

      The Low Tone is a generic tone used with various interruption patterns for the specific tones listed below: Line Busy Tone Reorder Reverting Tone No Circuit Tone No Such Number Vacant Code Group Busy Tone Deposit Coin Tone Vacant Position Tone Dial Off-Normal Tone Trouble Tone Dial Jack Tone Dial Test Signal Class of Service

    • How to Unlock a GoPhone

      How to Unlock a GoPhone

      GoPhone is the trademark used by AT&T/Cingular to market their pay as you go cell phones. Most customers will eventually want to switch to a more normal post-pay cell phone plan, and many of them will want to take their cell phones with them. Unfortunately, the GoPhones are "subsidy locked." This means that the GoPhones

    • IMEI (International Mobile Equipment Identity)

      IMEI (International Mobile Equipment Identity)

      Each GSM and UMTS mobile phone has a unique IMEI (International Mobile Equipment Identity) number. An IMEI number facilitates an important function – it easily identifies a mobile phone being used on a GSM (Global System for Mobile Communications) network. The IMEI is a useful tool to stop a stolen phone from accessing a network

    • How Cell Phone Tracking Works

      How Cell Phone Tracking Works

      Before GPS started being deployed in the majority of mobile devices sold on the market, the only method available to track a cell phone was triangulating the cell phone’s position using one of several techniques available to law enforcement and other governmental agencies. Today, most cell phone tracking applications work by accessing the GPS location

    • Blue Box

      Blue Box

      Blue boxes use a 2600hz tone to size control of telephone switches that use in-band signaling. The caller may then access special switch functions, with the usual purpose of making free long distance phone calls, using the tones provided by the Blue Box. To quote Karl Marx, blue boxing has always been the most noble

    • Types of Mobile Telephone Systems

      Types of Mobile Telephone Systems

      The main mobile telephone systems in the last twenty five years have been: YearMobile Telephone System 1981 Nordic Mobile Telephone (NMT) 1983 Advanced Mobile Phone System (AMPS) 1985 Total Access Communication Systems (TACS) 1986 Nordic Mobile Telephony (NMT) 1991 American Digital Cellular (ADC) 1991 Global System for Mobile Communication (GSM) 1992 Digital Cellular System (DCS)

    • TL1 (Transaction Language 1)

      TL1 (Transaction Language 1)

      TL1 (Transaction Language 1) is an element management protocol used primarily in the telecommunications industry. TL1 was designed by Bellcore (now Telecordia) in 1984 for use with its OSS (Operations Support System), NMA. TL1 is an MML (Man Machine Language), which means that TL1 messages should be readable and writeable by humans as well as

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