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  2. 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 four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

  3. Mobile number portability - Wikipedia

    en.wikipedia.org/wiki/Mobile_number_portability

    A key technical aspect of Mobile Number Portability (MNP) involves the routing of calls or mobile messages (SMS, MMS) to a number once it has been ported.Various call routing implementations exist globally, but the International and European best practice employs a central database (CDB) of ported numbers.

  4. List of mobile telephone prefixes by country - Wikipedia

    en.wikipedia.org/wiki/List_of_mobile_telephone...

    Users can switch carriers while keeping number and prefix (so prefixes are not tightly coupled to a specific carrier). If there is only 32.. followed by any other, shorter number, like 32 51 724859, this is the number of a normal phone, not a mobile. 46x: Join (discontinued mobile phone service provider) [3] 47x: Proximus (or other) 48x

  5. SIM swap scam - Wikipedia

    en.wikipedia.org/wiki/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.

  6. Network switching subsystem - Wikipedia

    en.wikipedia.org/wiki/Network_switching_subsystem

    If VLR data is corrupted it can lead to serious issues with text messaging and call services. Data stored include: IMSI (the subscriber's identity number). Authentication data. MSISDN (the subscriber's phone number). GSM services that the subscriber is allowed to access. access point (GPRS) subscribed. The HLR address of the subscriber.

  7. How do I activate my AARP membership? - AOL Help

    help.aol.com/articles/how-do-i-activate-my-aarp...

    With your complimentary 2-year membership, you’ll receive discounts on dining, travel, and personal health and get deals on dental, hearing, and cell phone plans. If you’re already an AARP member we’ll add two additional years to your current membership, be sure to enroll through AOL to receive this complimentary benefit.

  8. International mobile subscriber identity - Wikipedia

    en.wikipedia.org/wiki/International_Mobile...

    E.214 provides a method to convert the IMSI into a number that can be used for routing to international SS7 switches. E.214 can be interpreted as implying that there are two separate stages of conversion; first determine the MCC and convert to E.164 country calling code then determine MNC and convert to national network code for the carrier's ...

  9. Unstructured Supplementary Service Data - Wikipedia

    en.wikipedia.org/wiki/Unstructured_Supplementary...

    suppressing the transmission of caller's phone number (CLIR) for all subsequent calls # 31 # * 31 # * # 31 # 31 temporary change of the transmission of CLIR valid just for the next call; no final # # 31 # number * 31 # number: 330 total incoming and outgoing service barring password is network dependent, default on some networks is 0000

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