what are cdma mobile phones?
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CDMA (Code Division Multiple Access) and GSM (Global System for Mobiles) are shorthand for two older radio systems (2G and 3G) used in cell phones.
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CDMA: The American Contender The other well-travelled cellular technology is CDMA. CDMA was developed by Qualcomm. The CDMA brand name encompasses two different standards: IS-95 aka CDMA One, a 2G digital service, and its modern 3G successor CDMA-2000.
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A GSM carrier doesn't care what phone a SIM card is in. ... Because of this, there is no need for CDMA networks to lock phones, so in that sense, every CDMA phone is unlocked, but it doesn't matter because the blocking is done on the carrier end.
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WCDMA(Wideband Code Division Multiple Access) - definition. Wideband CDMA is a third-generation (3G) wireless standard which allows use of both voice and data and offers data speeds of up to 384 Kbps. ... WCDMA is also called UMTS and the two terms have become interchangeable.
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No, the two technologies are incompatible. GSM uses a SIM card to alert the network that you're a subscriber and allowed to use the network, CDMA uses the phones hardware ID to tell the network the same information. No, the two technologies are incompatible.
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First, neither GSM or CDMA is technically better; they ultimately provide the same service and the quality of a network depends on the carrier, not the cellular standard used. Second, GSM phones can be unlocked and switch carriers, whereas CDMA phones are locked to a carrier.
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In the US, Sprint, Verizon, and US Cellular use CDMA. AT&T and T-Mobile use GSM. Most of the rest of the world uses GSM. The global spread of GSM came about because in 1987, Europe mandated the technology by law, and because GSM comes from an industry consortium.
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TDMA technology is the less used from the three main digital technologies (GSM, CDMA and TDMA) and we think it will gradually be replaced to CDMA or GSM. ... At one corner, GSM operators say it is better “because it uses a SIM chip, it is the most used technology worldwide, it is more secure and it is more advanced”.
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The basic difference between the CDMA and WCDMA is bandwidth ,CDMA uses 1.25 mhz frequency bandwidth while WCDMA uses 5 mhz bandwidth. ... CDMA being 2g standard provide mainly circuit switched services while WCDMA being used in UMTS system is used in both circuit switched and packet switched networks.
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CDMA networks allow for a greater number of users, meaning their capacity is greater than that of GSM networks. Moreover, CDMA is the infrastructure on which all 3G networks are based — for both GSM and CDMA carriers.
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CDMA is short for Code-Division Multiple Access, a digital cellular technology that uses spread-spectrum techniques. CDMA does not assign a specific frequency for each user placing or receiving a call. ... TDMA technology divides a radio frequency into time slots and then allocates these time slots to multiple calls.
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2G, understood as GSM and CDMA, has been superseded by newer technologies such as 3G (UMTS / CDMA2000), 4G (LTE) and 5G; however, 2G networks are still used in most parts of Europe, Africa, Central America and South America. ... No plan to shut down 2G.
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GSM vs CDMA Carriers operate under one of two types of networks: CDMA or GSM. Out of the four biggest carriers with their own network, AT&T and T-Mobile run on GSM, while Sprint and Verizon Wireless use CDMA. ... In general, an unlocked GSM phone from AT&T and T-Mobile will work on each other's networks.
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You cannot use a GSM SIM card in a mobile device that is designed to work exclusively with CDMA because CDMA and GSM are two different technologies. However, you can use a GSM SIM card in a mobile device which incorporates both CDMA and GSM technology. Check your phone's specifications to see if it has this capability.
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CDMA and GSM networks are two types of cellular phone networks, and generally, if you have a phone made for one, it can't be used on the other. In the US, Sprint®* and Verizon run on the CDMA networks while AT&T and T-Mobile run on the GSM networks. Ting runs on both.
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Right now, some phones support all four carriers by combining CDMA, GSM, and LTE. The Motorola Moto G4, E4, and later; the Samsung Galaxy S7 and later; and Google Pixel phones all work across all four carriers.
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If your phone has an MEID or an ESN number, it's CDMA. If you see an IMEI number then it's GSM. If you see both, then your device supports both technologies (lucky you!).