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    • How Do Prepaid Phone Cards Work?

      How Do Prepaid Phone Cards Work?

      As more and more people switch to cell phones for communication, many people are opting to use prepaid phone cards rather than signing up for a contract with a service provider. Prepaid phone cards allow users to purchase temporary plans ahead of time and use their minutes from wherever they are without having to worry

    • Phone Phreaking

      Phone Phreaking

      Phone phreaking is the act of gaining illegal access to resources of telecom networks for fun or malicious activity. Before computer hacking took over, phreaking was the dominant underground tech activity. Some phone phreakers just wanted to understand how telecom infrastructure worked. Others wanted to make free long distance phone calls. As voice and data

    • 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

    • Predictive Dialer Software

      Predictive Dialer Software

      Predictive dialer software is designed to automatically dial the correct number of telephone calls to match the pattern of available call center personnel. Without predictive dialing software, an outbound call center will have to wait between phone calls until another person answers the phone. This can be quite expensive in terms of lost productivity. With

    • 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

    • 15 Ways to Improve Your Phone’s Battery Life

      15 Ways to Improve Your Phone’s Battery Life

      Although mobile phones have become almost ubiquitous in modern culture, device manufacturers have yet to solve the problem of significantly improving the battery life of mobile phones significantly. As a result, consumers must seek out methods to manage the overall application and program usage on their cell phones in order to improve the overall life

    • Unlocked Cell Phones

      Unlocked Cell Phones

      To understand what an unlocked cell phone is, it is important to first understand what a locked cell phone is. A locked cell phone is one that can only be used with one cellular service provider. In contrast, an unlocked cell phone can be used with any cellular service provider. When a cell phone is

    • 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

    • 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

    • 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

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