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    • 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

    • ESN (Electronic Serial Number)

      ESN (Electronic Serial Number)

      ESN (Electronic Serial Number) An Electronic Serial Number is a code created to identify mobile devices. An ESN is 32 bits long, and the distribution of information in those bits has changed as the standard has evolved. The first 8 bits originally represented the manufacturer code, leaving 24 bits for the manufacturer to assign codes

    • CLEC (Competitive Local Exchange Carrier)

      CLEC (Competitive Local Exchange Carrier)

      A CLEC, or Competitive Local Exchange Carrier, is a type of telecommunications provider that was formed after the breakup of AT&T. CLECs are usually smaller telecommunications providers that compete with ILECs, or Incumbent Local Exchange Carriers, which were already in place before AT&T’s separation. While CLECs generally provide the same services as ILECS for less,

    • Cell Phone Jammer

      Cell Phone Jammer

      With so many people using cell phones these days, one of the devices that have popped- up on the market are cell phone jammers. Be advised that cell phone jammers are usually black market devices, since using them is illegal in most municipalities. However, for those that are tired of hearing endless cell phone conversations

    • How Do Cell Phones Work?

      How Do Cell Phones Work?

      As technology has improved over the past few decades, cell phones have only gotten better and better.Though most people do not stop to consider the idea, it is still an amazing feat even today that what was once only an idea presented in movies and novels, has now become our number one modern-day communication device.

    • UMTS (Universal Mobile Telecommunications System)

      UMTS (Universal Mobile Telecommunications System)

      UMTS is an abbreviation for Universal Mobile Telecommunications System. It is one of the third-generation (3g) cell phone technologies quickly developing today. UTMS is also referred to as the 3GSM so as to emphasize the coalition between 3G technology and GSM standard. In theory, the UTMS, using W-CDMA, is supposed to be able to transfer

    • Loop Start

      Loop Start

      Loop start is a a signaling technique in which a party gets a dial tone by closing (shorting) a DC current loop. In a loop start signaling system, the electrical loop between your telephone and your central office (CO) is normally open. When you pick up the telephone handset, it causes a circuit to be

    • DTMF (Dual-Tone Multi-Frequency)

      DTMF (Dual-Tone Multi-Frequency)

      DTMF tones, or Dual-Tone Multi-Frequency signaling, are audible tones that are used by touch-tone telephones to identify which number key was pushed by the operator. DTMF tones have been used since 1963 and are used by all standard touch-tone telephones in the United States as well as in many other countries around the world. DTMF

    • 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

    • 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

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