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2. Digital current loop interface - Wikipedia

   en.wikipedia.org/wiki/Digital_current_loop_interface

   A digital current loop uses the absence of current for high (space or break), and the presence of current in the loop for low (mark). [1] This is done to ensure that on normal conditions there is always current flowing and in the event of a line being cut the flow stops indefinitely, immediately raising the alarm of the event usually as the heavy noise of the teleprinter not being synchronized ...

3. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).

4. 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.

5. Mobile phone accessories - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone_accessories

   Wi-Fi SDs are Wi-Fi communication devices on a special SD card inserted into the SD card slot. They can move pictures to a local computer or an online photo-sharing service. Additionally, many devices have USB On-The-Go and support USB storage, in most cases using either a special USB micro-B flash drive or an adapter for a standard USB port.

6. Loopt - Wikipedia

   en.wikipedia.org/wiki/Loopt

   Loopt for the iPhone became available to US customers of the Apple iTunes App Store on July 11, 2008. In the summer of 2008, Loopt sponsored Black20.com's The Middle Show with host Dave Price. In October 2008, Loopt was sued by Earthcomber for patent infringement. [11] The case was dropped by Earthcomber in March 2009. [12]

7. Pacific Bell Wireless - Wikipedia

   en.wikipedia.org/wiki/Pacific_Bell_Wireless

   Pacific Bell Wireless, LLC is a wireless operating division of AT&T Mobility. [1] Pacific Bell Wireless is legally known as Pacific Bell Wireless, LLC d/b/a Cingular Wireless . [ citation needed ]