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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. WiMAX and LTE use OFDM.
The A23 5G is Samsung's entry-level Galaxy phone, but it still offers plenty of great features that make it senior-friendly, including the “Easy Mode,” which simplifies the interface.
True 3G systems such as EV-DO, W-CDMA (including HSPA and HSPA+) provide combined circuit switched and packet switched data and voice services from the outset, usually at far better data rates than 2G networks with their extensions. All of these services can be used to provide combined mobile voice access and Internet access at remote locations.
All major and regional MNOs use 4G LTE / LTE Advanced and 5G NR protocols (2G and 3G having been deprecated and shut down), with GSM technologies. However, many MVNOs tend to sell somewhat older phone models (e.g. ones discontinued by the host networks), which can affect whether all technologies supported by the carrier network are usable by ...
The comparable technology in the context of GSM is GSM-1800, also known as "Digital Cellular System" (DCS). [10] GSM-1800 launched in Hong Kong in 1997. It can form dual band service with GSM at 900MHz. This frequency was inherited into UMTS, LTE, and 5G NR. Korea, which has never used GSM, runs CDMA on 1800 MHz. See CDMA frequency bands.
Initially the SMR band could only be used for narrowband wireless technologies such as iDEN technology. In 2004 the FCC developed a new band plan where narrowband operations are provided in 806–816 and 851–861 MHz ranges while wideband operations are allowed in 817–824 MHz and 862–869 MHz separated from narrowband services by a 1 MHz ...
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