• Main Menu
  • Telephony

    • How to Restore a Blackberry to Factory Settings

      How to Restore a Blackberry to Factory Settings

      A Blackberry is a “smartphone” that integrates a phone, media player, email client, web browser, camera, and personal digital assistant (PDA) in a single device. It has many purposes and allows users to perform a number of tasks such as creating notes, accessing the Internet, and scheduling events. Blackberry phones represent over 14% of the

    • AMPS (EIA/TIA-553) and NAMPS (IS-91)

      AMPS (EIA/TIA-553) and NAMPS (IS-91)

      Mobile Frequency Range Rx: 869-894; Tx 824-849 Multiple Access Method FDM Duplex Method FDD Number of Channels 832 Channel Spacing 30kHz Modulation FM AMPS AMPS (Advanced Mobile Phone Service) was the first cellular mobile system in the United States. AMPS operates as an analog system using 30 kHz wide channels. NAMPS AMPS was later enhanced

    • Ringback

      Ringback

      A ringback number is a number that you call that will immediately ring the telephone from which it was called. In most instances you must call the ringback number, quickly hang up the phone for just a short moment and then let up on the switch, you will then go back off hook and hear

    • 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 Do Prepaid Cell Phones Work?

      How Do Prepaid Cell Phones Work?

      A prepaid cell phone is one that allows users to pay in advance for their service without the commitment and penalties of a long term contract. While contract plans are still the most popular form of mobile phone service, prepaid cell phones have become very popular in recent years and have grown in use amidst

    • GSM (Global System for Mobile Communications)

      GSM (Global System for Mobile Communications)

      The Global System for Mobile Communications (GSM) system is a widely deployed digital mobile telephony standard that is deployed throughout Europe and other locations around the globe. The GSM standard leverages a variant of TDMA (time division multiple access) and is the most deployed of the three competing legacy digital wireless technologies on the market

    • What is SMS (Short Message Service)?

      What is SMS (Short Message Service)?

      SMS, or Short Messaging Service, is a text-based messaging service that is used by over 2.4 billion mobile phone users worldwide. SMS allows users to send and receive text-based messages, pictures, videos, and audio clips from other mobile phone users and desktop computer users who have applications that can interact with mobile phones. SMS differs

    • 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

    • 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

    • iDEN (Integrated Digital Enhanced Network)

      iDEN (Integrated Digital Enhanced Network)

      An IDEN, or Integrated Dispatch Enhanced Network, is a radio service provided by some mobile telephones that allows subscribers to talk to nearby subscribers who have similar phones without dialing their individual numbers. IDENs are often provided as a free service on modern mobile phones, such as Nextel, or as a premium service that can

    118 queries in 1.183 seconds.