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    • 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

    • Numbers that Temporarily Disconnect Phone Service

      Numbers that Temporarily Disconnect Phone Service

      Many telephone companies maintain telephone numbers to which if a call is made will temporarily disconnect your telephone service for testing. If your NPA is not listed, or the listing does not cover your LATA, try common numbers such as 119 (GTD5 switches) or 511. NPA Telephone Number Geography Length of disconnection 209 999 Stockton,

    • How Mobile Phones Are Dangerous to Health

      How Mobile Phones Are Dangerous to Health

      Since the number of cell phone users has continued to increase to more than six billion subscriptions at the turn of the decade, a common question that continues to get asked is how dangerous are mobile phones to one’s health? This question has continued to be asked over the past several decades since mobile phones

    • CLLI Codes

      CLLI Codes

      CLLI codes, or Common Language Location Identifier, pronounced “silly codes”, are codes used by telecommunication companies to identify specific industry equipment. CLLI codes are 11 characters long, may be comprised of a combination of letters and numbers, and are used by all telecommunication companies in North America. While CLLI codes were first created and used

    • How Do I Setup MMS on My Mobile?

      How Do I Setup MMS on My Mobile?

      MMS, Multimedia Messaging Service, is a widely used communication channel over mobile phones to send and receive multimedia like images, ringtones, and videos. Most modern mobiles phones are MMS enabled. To use MMS service on your mobile phone, you need to do 2 things: Activate the MMS Service from your Service Provider. Upon activation by

    • 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

    • Prepaid Cell Phones vs Contract Phones

      Prepaid Cell Phones vs Contract Phones

      Prepaid cell phones are mobile phones that are not associated with a long term contract and, therefore, do not incur the overage charges and late fees associate with contract plans. Prepaid cell phones are paid before the mobile service is activated on a monthly or “pay-as-you-go” basis and are deactivated when the service term expires

    • Caller-ID

      Caller-ID

      Calling Number Delivery (CND), better known as Caller ID, is a telephone service intended for residential and small business customers. It allows the called Customer Premises Equipment (CPE) to receive a calling party's directory number and the date and time of the call during the first 4 second silent interval in the ringing cycle. Caller-ID

    • Call Back Security

      Call Back Security

      Call back security, also known as dial back security, is a security mechanism used to authenticate users over dialup lines. The way call back security works is the dialup user calls into the system and enters his username and password. The system then hangs up on the user and calls the user back at a

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