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    • Telephone Voltage

      Telephone Voltage

      Telephone voltage is actually related to the physical distance at which you can operate the telephone. If the voltage is high, it can signal to great distance. However, higher voltage carries certain risks. 48 V is a compromise between distance and safety. 50-52 V is used in central office common batteries, but designations and documents

    • How to Change my PIN and PUK

      How to Change my PIN and PUK

      A PIN, or Personal Identification Number, is a number that is used on some SIM cards to prevent unauthorized use of the cell phone it is located in. PINs are not used by all SIM cards and may need to be setup before they can be used. A PIN is generally between 4 and 8

    • Cell Phone Interceptors

      Cell Phone Interceptors

      Millions of people use monitoring systems and devices for several purposes. Monitoring systems and devices have been around for quite some time and are designed to increase the level of security and protection in facilities. Among the technologies that the cell phone industry created, the cell phone interceptor is what experts consider one of the

    • ANI (Automatic Number Identification)

      ANI (Automatic Number Identification)

      ANI (Automatic Number Identification) is a system utilized by telephone companies to identify the DN (Directory Number) of a calling subscriber. Automatic number identification permits subscribers to capture or display caller’s telephone number. This feature was developed by AT&T, and it should not be confused with new caller ID services. AT&T developed this feature for

    • Tumbling

      Tumbling

      Tumbling exploits a weakness in the AMPS/NAMPS roaming system. In tumbling, you first configure the SIDH in your mobile telephone to pretend to be from another cellular carrier. If you are in Colorado, for example, you would configure your mobile telephone as if it were subscribed to a cellular carrier in Texas. Next, you modify

    • How Do I Locate My Lost Cell Phone?

      How Do I Locate My Lost Cell Phone?

      Many of us have lost our cell phones from time to time but some may have a harder time than others in retrieving their phone. What is worse is when you lose your cell phone in the middle of a texting session or when you have an important phone call to make and the person’s

    • LEC (Local Exchange Carrier)

      LEC (Local Exchange Carrier)

      An LEC, or Local Exchange Carrier, is a telephone company that is responsible for managing calls within a specific territory, such as a city or county. The vast majority of the United States is managed by LECs, which differ from IXCs, or Interexchange Carriers. While LECs manage local calls between two parties, IXCs are responsible

    • How to Unlock a BlackBerry

      How to Unlock a BlackBerry

      Many wireless providers across the globe, including AT&T/Cingular, T-Mobile, Vodafone, and Verizon sell Blackberries. When these companies sell a BlackBerry, they do so at a discount in order to attract customers. The providers then make up the lost profits over the lifetime of their contract with the customer. To protect those profits, the wireless providers

    • How to Update the Blackberry OS

      How to Update the Blackberry OS

      The BlackBerry OS is deployed on mobile devices used in 91 countries across more than 500 service operators. Research In Motion (RIM) developed the operating system since 1999, which allows mobile devices to act as both digital assistants and portable media players depending on the type of device purchased. A common task that arises for

    • Phone Prefixes

      Phone Prefixes

      Phone prefixes are the codes that tell the phone companies which state, city, or county a person is calling from. As more people move to an area the phone prefixes change and additional ones are added. Depending on the state, there may only be a few prefixes. Prefixes help to differentiate between each person's phone

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