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2. 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.

3. T-Mobile US - Wikipedia

   en.wikipedia.org/wiki/T-Mobile_US

   On September 2, 2001, VoiceStream Wireless Inc. adopted the name, T-Mobile USA, Inc. and began rolling out the T-Mobile brand, starting with locations in California and Nevada. [19] T-Mobile USA, Inc. was an operating entity of T-Mobile International AG, [4] before becoming a direct subsidiary of Deutsche Telekom AG. [20]

4. List of countries by 4G LTE penetration - Wikipedia

   en.wikipedia.org/wiki/List_of_countries_by_4G...

   The following is a list of countries by 4G LTE coverage as measured by Juniper Networks in 2013 and published by Bloomberg. [9][10] Rank. Country/Territory. Penetration. 1. South Korea. 86.0%. 2. Japan.

5. 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.

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

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

   Voice and data service operators. In general, the types of phones and other devices supported by the MVNOs are in line with the technologies used by the Mobile Network Operator (MNO), the underlying cellular network provider. All major and regional MNOs use 4G LTE / LTE Advanced and 5G NR protocols (2G and 3G having been deprecated and shut ...

7. European Union roaming regulations - Wikipedia

   en.wikipedia.org/wiki/European_Union_roaming...

   The Roaming Regulation 2022 ((EU) 2022/612) bans roaming charges (Eurotariff) within the European Economic Area (EEA), which consists of the member states of the European Union, Iceland, Liechtenstein and Norway. This regulates both the charges mobile network operator can impose on its subscribers for using telephone and data services outside ...