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  2. Type Allocation Code - Wikipedia

    en.wikipedia.org/wiki/Type_Allocation_Code

    The Type Allocation Code (TAC) is the initial eight- digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM, UMTS, LTE, 5G NR, iDEN, Iridium or other IMEI-employing wireless network ...

  3. SIM swap scam - Wikipedia

    en.wikipedia.org/wiki/SIM_swap_scam

    SIM swap scam. A SIM swap scam (also known as port-out scam, SIM splitting, [1] simjacking, and SIM swapping) [2] is a type of account takeover fraud that generally targets a weakness in two-factor authentication and two-step verification in which the second factor or step is a text message (SMS) or call placed to a mobile telephone.

  4. List of mobile virtual network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_virtual...

    Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the three major cellular carriers in the country, AT&T Mobility, T-Mobile US, and Verizon. [1] [2] In 2016, MVNOs across the nation such as Metro PCS, Boost Mobile, Cricket Wireless, and Tracfone brands served about 36 million subscribers.

  5. 30 Scam Phone Numbers To Block and Area Codes To Avoid - AOL

    www.aol.com/finance/19-dangerous-scam-phone...

    Since there is no limit to a scam artist’s potential, recognizing signs of common scams will serve you well. Here are examples of three of the most common scams out there today and how to block ...

  6. Avoid Answering Calls from These Area Codes: Scam Phone ... - AOL

    www.aol.com/lifestyle/avoid-answering-calls-area...

    The post Avoid Answering Calls from These Area Codes: Scam Phone Numbers Guide appeared first on Reader's Digest. All it takes is a quick glance to know if the call is for real or not. The post ...

  7. What You Need to Know About Phone Scams - AOL

    www.aol.com/know-phone-scams-180248742.html

    People talking phone. Men and women calling by telephone. Communication and conversation with smartphone vector characters set. Illustration of phone call, speaking social, talking and chatting

  8. Cellular frequencies in the United States - Wikipedia

    en.wikipedia.org/wiki/Cellular_frequencies_in...

    There are 51 MTAs, 493 BTAs and 175 EAs in the United States. The Advanced Wireless Services (AWS) bands, auctioned in the summer of 2006, were for 1,710–1,755 MHz, and 2,110–2,155 MHz. The spectrum was divided into blocks: A blocks were for Cellular Market Areas, based on existing cellular (1G) licenses, and were 2 × 10 MHz.

  9. Telemarketing fraud - Wikipedia

    en.wikipedia.org/wiki/Telemarketing_fraud

    First Orion's scam blocking technology uses a combination of known bad actors, AI powered blocking including neighborhood spoofing and unusual calling pattern. Scam Identification is a feature of the T-Mobile and Metro carrier network which can be controlled by the app Scam Shield, customer care or dialing the short code #664 to turn on or off ...

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