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2. List of mobile virtual network operators in the United Kingdom

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

   List of mobile virtual network operators in the United Kingdom. This is a list of notable mobile virtual network operators (MVNOs) in the United Kingdom, which lease wireless telephone and data spectrum from the major carriers EE, O2, Three and Vodafone for resale.

3. List of mobile network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_network...

   AT&T, T-Mobile, Verizon, Boost Mobile, and UScellular also sell SIM cards through their retail channels, both in-store and online. The top five wireless providers operate nationwide wireless networks which cover most of the population in the United States, while smaller carriers provide native network coverage across selected regions of the ...

4. Uswitch - Wikipedia

   en.wikipedia.org/wiki/Uswitch

   uSwitch is accredited under the Ofgem Confidence Code, [10] a voluntary code of practice for online domestic price comparison services. uSwitch was involved in the formation of the Confidence Code in 2002 with Consumer Focus, which managed the code until Ofgem took over in 2013. uSwitch.com was previously accredited by Consumer Focus, and played a role in the industry consultation which led to ...

5. Mobile by Sainsbury's - Wikipedia

   en.wikipedia.org/wiki/Mobile_by_Sainsbury's

   Website. www.sainsburys.co.uk. Mobile by Sainsbury's was a mobile virtual network operator (MVNO) in the UK, operated by Sainsbury's between July 2013 and January 2016, using the Vodafone UK network. [1] Sainsbury's operated an earlier mobile virtual network that was launched in 2001 but only lived until 2003.

6. Comparison of mobile phone standards - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_mobile_phone...

   In 3G, the most prevalent technology was UMTS with CDMA-2000 in close contention. All radio access technologies have to solve the same problems: to divide the finite RF spectrum among multiple users as efficiently as possible. GSM uses TDMA and FDMA for user and cell separation. UMTS, IS-95 and CDMA-2000 use CDMA.

7. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) T-Mobile nano-SIM card with NFC capabilities in the SIM tray of an iPhone 6s cell phone A SIM (Subscriber Identity Module) card 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 ...