Upon verifying and doing research one them i found that they are actually both supporting cdma and gsm because of new intel chip. Some phones do offer both, such as world phones but they physically have 2 chips inside, one for gsm and one for cdma. Technically gsm global system for mobile communications, originally from groupe special mobile is a specification of an entire wireless network infrastructure, while cdma relates only to the air interface the radio portion of. Developed and maintained by the 3gpp 3rd generation partnership project, umts is a component of the international telecommunications union imt2000 standard set and compares with the cdma2000 standard set for networks based on the competing cdmaone. Traveling soon and would prefer to bring this phone instead of my. You must know wcdma which stands for wide band code division multiple access. Mar 20, 2020 such standards included cdma ds, cdma mc, and some tdd technologies. May 05, 2010 code division multiple access technologies based on cdma. What smartphones are compatible with both cdma and gsm. Gsm and cdma are the two ways phones talk to cell towers. This means that choosing between cdma and gsm may not be necessary if youre not attempting to switch to a different network. Superior internal antennas for both cellular and gps eliminate the need for wired antennas and make the ttu700 mountable virtually anywhere on the trailer for easy, inexpensive installations. The gsm base station subsystem bss and the wcdma radio access network ran are both connected to the gsm core network for providing a radio connection to the handset.
Gsm supports transmitting data and voice both at once, but cdma have not this feature. Let us discuss some more differences between gsm and cdma in. Both technologies can be used with 3g standard phones, but 3g gsm speeds can be faster than 3g cdma speeds, which can make a big difference for those who use their phones for social networking, email and streaming video. One need only pop a sim card in and the phone will connect to the towers and activate. While in the us it will use verizons cdma network while roaming outside it will be on verizons partner vodafones gsm network. They can be used as a gsm or cdma phone according to the users preference. However, there are some older phones that will work across both gsm and cdma networks. Cdma i about the tutorial code division multiple access cdma is a channel access method normally used by 3g radio communication technology as well as in some other technologies. Pure gsm phones wont work on a cdma network, and vice versa. I called tracphone and they said the phone is already unlocked and that i can use a different carrier. Dsss and fhss physical layer options have been designed specifically to overcome the interfering with other devices in this band. They were both developed in the early nineties for 2g connectivity.
Both the technologies can be used with 3g standard phones, but 3g gsm speeds can be faster than 3g cdma speeds. This site contains user submitted content, comments and opinions and is for informational purposes only. It is used in cellular communication similar to gsm and is a second generation and third generation standard for mobile networks. But engineers couldnt agree on which one was the best. Both have introduced 3g mobile phones in their fold in a big way. Growing both the quantity of nc and mc open entryways for various. Code division multiple access technologies based on cdma. Cdma established the foundation for 3g technologies is95 cdmaone initial cdma standard from qualcomm may 1995 mobile 3g evolved into two competing standards both based on cdma cdma2000 uses 1. In 1985, the fcc allocated three frequency bands to spread spectrum communications.
If you want to check out what other phones work on which technology, you can use our phone compatibility tool below. Gsm digitizes and compresses data, then sends it down a channel with two other streams of user data, each in its own time slot. In this chapter, we turn to a network of many mobile users interested in. Cdma can be implemented in several ways, two of which are frequency hopping and direct sequencing. Cdma, or code division multiple access, was a standard designed and patented by qualcomm, but subsequently used as the basis for the cdma2000 and wcdma standards for 3g. Global system for mobile communication gsm definition global system for mobile communication gsm is a globally accepted standard for digital cellular communication. This page is being displayed here as a courtesy of gsm arena. Both gsm and cdma are rapidly improving their capabilities in this regard too. Checked and compared the bands and they are identical with gsm and cdma which means that theres really no difference. Ofdm stands for orthogonal frequency division multiplexing.
Theyre ways for people to cram multiple phone calls or internet connections into one radio channel. Introduction to cdma code division multiple access cdma is a radically new concept in wireless communications. Difference between gsm and cdma with comparison chart. It allow the mobile handset to obtain much higher data speed than what standard gsm can offers.
There was a company that announced a chip that actually supports gsm and cdma but i dont we will ever see it as everyone is moving to wimax or lte. Wcdma wide band code division multiple access umts before we talk about 4g or gsm. Jul 28, 2014 gsm uses a variation of time division multiple access tdma and is the most widely used of the three digital wireless telephony technologies tdma, gsm, and cdma. Comparison between cdma and tdma air interface for. I have sprint and att right now and dont want to carry two phones anymore. Jan 14, 2020 cdma and gsm are 3g networks, but both cdma and gsmnetworked phones are able to use 4g lte as long as the smartphone itself supports a 4genabled sim card. The most common older phones that work on both technologies include the iphone 6 series and samsung galaxy s6 series. I bought a phone from tracphonecdma provider and want to use it on attgsm provider. We half toying with going to tmobile, but there are persistent concerns over network quality vs verizon, for some of the specific areas we travel to. Gsm stands for global system for mobile communication, while cdma stands for code division multiple access gsm uses fdma frequency division multiple access and tdma time division multiple access. Updated 1222019 many of the comments i read on this question are not only wrong, but are spreading misinformation, which is pretty messed up.
It also mentions tutorial links on gsm and cdma useful to derive further difference between gsm and cdma. The technicality of cdma technology has given significant advantages over other parallel technologies in terms of spectrum efficiency and overall performance. Thus, it is used in the rural areas where gsm cannot cover. Gsm stands for global system for mobile communications its the standard system for most of the world.
The evolution process of the cdma standards is roughly divided into the following stages. What phones are compatible with both cdma and gsm networks. Both gsm and cdma standards get multiple access, meaning that a large number of calls can go through a single cell phone tower. However, yeah im pretty sure the note 4 is one or the other. The ratio of the code rate to the information bit rate is called both the spreading factor and the processing gain of the cdma system. Both frequency division duplex fdd and time division duplex tdd variants are supported. Gsm is in use over 80% of the worlds mobile networks in over 210 countries as compared to cdma. Discussion in android devices started by john smith12345673d, sep 12, 2017. Sep 27, 2019 cdma stands for code division multiple access. On the other hand, in cdma the network identifies a handset by the information stored in the internal memory and hence, its handset specific. North and south american would have the 850 mhz and 1900 mhz bands. Umts combines three different terrestrial air interfaces, gsms mobile application part map core, and the gsm family of speech codecs the air interfaces are called umts terrestrial radio access utra. However, lte, which stands for longterm evolution, is fast becoming ubiquitous. Gsm and cdma are competing wireless technologies with gsm enjoying about an 82% market share globally.
The universal mobile telecommunications system umts is a third generation mobile cellular system for networks based on the gsm standard. You can find the guidelines for evaluation, known as m. Sep 27, 2016 the basic difference between gsm and cdma is that the gsm is a sim specific i. Evolution of the cdma standards telecommunications blog. I am looking for a cell phone that does cdma and gsm on the same phone, at the same time. In some cases the first or last digit of cid represents cells sector id. Cdma and gsm are 3g networks, but both cdma and gsmnetworked phones are able to use 4g lte as long as the smartphone itself supports a 4genabled sim card. In gsm traffic and signaling follow different multiframe structure. This technology is used in ultrahighfrequency uhf cellular telephone systems in the 800mhz and 1. The main distinction between gsm and cdma is that in gsm, the customer information is put on a sim card. Cdma and gsm which type of network do you prefer cdma or. A gsm cell id cid is a generally unique number used to identify each base transceiver station bts or sector of a bts within a location area code lac if not within a gsm network in some cases the first or last digit of cid represents cells sector id. These phones include combination of gsm and cdma technology. Gsm and cdma are different technologies that phones use to connect.
I have verizon, but no 2 year contract, so is my phone not locked to cdma since i dont have a contract. Cdmaone namely, is95a and is95b it mainly supports the voice service, belonging to 2g communications. Cdma and gsm are both multiple access technologies. In this chapter, we turn to a network of many mobile users interested in communicating with a common. Gsm digitizes and compresses data, then sends it down a channel with two other. It has gained widespread international acceptance by cellular radio system operators as an upgrade that will dramatically increase both their system capacity and the service quality.
Both ofdm and cdma are wideband wireless digital communication systems widely used for fixed as well as mobile applications. Gsm and cdma both serve as shorthand for different mobile phone. Newer flagship devices, particularly the unlocked versions, have both gsm and cdma radios in them. Cdma is almost exclusively used in the united states and some parts of canada and japan. The main distinction between gsm and cdma is that in gsm, the customer information is put on a sim card which can be moved to a new mobile phone. In the currently most popular variant for cellular mobile telephones, wcdma imt direct spread is used. Apple may provide or recommend responses as a possible solution based on the information provided. A gsm cell id cid is a generally unique number used to identify each base transceiver station bts or sector of a bts within a location area code lac if not within a gsm network. The development of code division multiple access cdma enabled third. The itur went through an evaluation process of them all. In code division multiple access cdma, each user is assigned a different pseudorandom binary sequence that modulates the carrier, spreading the spectrum of the waveform and giving each user a unique code pattern. Gsm works on four different bands such as 900 mhz and 1800 mhz for europe and asia. They have been developed to support voice as well as data communications between various subscribers located across the world.
Which phones can i use on both cdma and gsm networks. Gsm vs cdma whats the difference between the two technologies. One of the main advantages of cdma is that dropouts occur only when the phone is at least twice as far from the base station. Cdma has introduced evdo or cdma 2000 to cement its position in the market, and gsm has introduced edge enhanced data rates for. Best unlocked smartphones that work with any cellular network. These dual mode handsets are compatible with both gsm and cdma networks and are essentially 2 phones in one device. However, the one chief difference between the two standards involves the way the data is transformed through the radio waves a smartphone receives and broadcasts. What smartphones are compatible with both cdma and gsm networks.
Gsm uses a variation of time division multiple access tdma and is the most widely used of the three digital wireless telephony technologies tdma, gsm, and cdma. Both the gsm and cdma are cellular wireless technologies. Gsm is the name of a standardization group established in 1982 to create a common european mobile telephone standard. I have an iphone 6s which i read is supposed to be both cdma and gsm compatible but is sometimes locked once used on a network. Such standards included cdma ds, cdma mc, and some tdd technologies. The iphone models sold for verizon and sprint service iphone model a1660 and iphone plus a1661 have the hardware needed to work with both gsm. Cdma code division multiple access or cdma has its roots in wwii era spread spectrum technology. Gsm interworking unit giwuthe giwu consists of both hardware and software that provides an interface to various networks for data communications.
All air interface options are part of itus imt2000. Whereas only mobile phones from a set of whitelisted companies can be used with a cdma network. As such it gave a significant step forwards over the tdma fdma schemes used for 2g, enabling data transmission in a way that had not been previously possible. Let us discuss some more differences between gsm and cdma in the comparison chart shown below. Will any of the samsung notes work with both gsm and cdma. Wcdma the radio technology of umts is a part of the itu imt2000 family of 3g standards. Technically gsm global system for mobile communications, originally from groupe special mobile is a specification of an entire wireless network infrastructure, while cdma relates. Mar 23, 2010 currently, if you buy a phone, you either go with gsm or cdma. Gsm and cdma spectrum frequencies the cdma network operates in the frequency spectrum of cdma 850 mhz and 1900 mhz while the gsm network operates in the frequency spectrum of gsm 850 mhz and 1900 mhz. Global system for mobile communication gsm is a globally accepted standard for digital cellular communication. It is the most secure mode of communication because of its spread spectrum property. Gsm vs cdma slideshare 9272016 the basic difference between gsm and cdma is that gsm is specific to a sim card that is used with the mobile phone.