CDMA vs GSM Difference and Comparison. GSM and CDMA are competing wireless technologies with GSM enjoying about an 8. In the U. S., however, CDMA is the more dominant standard. GSM and CDMA differ in terms of coverage, data speed, roaming, and SIM cards. For instance, while a GSM phone usually has. What CDMA vs. GSM Means to You. For call quality, the technology you use is much less important than the way your carrier has built its network. We take a closer look at some of the differences between GSM and CDMA networks, and how they matter to us as a consumer. Chances are, youve likely run into the acronyms CDMA and GSM before. Check out our guide for a closer look at the two wireless standards. When choosing a cell phone carrier, you may have to decide which between CDMA vs GSM is the best for you. Aplikasi Pengganti Format File. You may have heard the terms GSM and CDMA thrown around before in a conversation about cell phones, but what do they really meanCDMA vs GSM comparison. GSM and CDMA are competing wireless technologies with GSM enjoying about an 82 market share globally. In the U. S., however, CDMA is the more. GSM vs. CDMA. Whats the difference between CDMA and GSM cell phone network standards Learn about GSM and CDMA at Wirefly. Understand the technologies of the major cell phone service carriers and unravel the differences between the GSM, EDGE, CDMA, and TDMA. Technically GSM Global System for Mobile communications, originally from Groupe Spcial Mobile is a specification of an entire wireless network infrastructure, while CDMA relates only to the air interface the radio portion of the technology. Code division multiple access CDMA describes a communication channel access principle that employs spread spectrum technology and a special coding scheme where each transmitter is assigned a code. CDMA also refers to digital cellular telephony systems that use this multiple access scheme, as pioneered by QUALCOMM, and W CDMA by the International Telecommunication Union ITU, which is used in GSMs UMTS. Subscriber Identity Module SIM CardSIM subscriber identity module card, the onboard memory device that identifies a user and stores all of his information on the handheld. You can swap GSM SIM cards between handsets when a new one is necessary, which enables you to carry all of your contact and calendar information over to a new handset with no hassle. CDMA operators answer this flexibility with their own service that stores user data, including phone book and scheduler information, on the operators database. This service makes it possible to not only swap over to a new handset with little trouble, but it also gives users the ability to recover contact date even if their phone is lost or stolen. International Roaming with GSM and CDMAWhere international business travel is an issue, GSM leaps forward in the race for the title of Most Accessible. Because GSM is used in more than 7. Europe, India, and most of Asia and still use their cell phones. CDMA offers no multiband capability, however, and therefore you cant readily use it in multiple countries. However, certain phones like the i. Phone 5 now have Quad band GSM built in so they can be used overseas with special calling plans from carriers. Data Transfer Methods in GSM vs. CDMAAnother difference between GSM and CDMA is in the data transfer methods. Manual Lavavajillas Bru. GSMs high speed wireless data technology, GPRS General Packet Radio Service, usually offers a slower data bandwidth for wireless data connection than CDMAs high speed technology 1x. RTT, short for single carrier radio transmission technology, which has the capability of providing ISDN Integrated Services Digital Network like speeds of as much as 1. Kbps kilobits per second. However, 1x. RTT requires a dedicated connection to the network for use, whereas GPRS sends in packets, which means that data calls made on a GSM handset dont block out voice calls like they do on CDMA phones. Interaction between GSM and CDMA In cities and densely populated areas, there are often high concentrations of GSM and CDMA connection bases. In theory, GSM and CDMA are invisible to one another and should play nice with one another. In practice, however, this is not the case. High powered CDMA signals have raised the noise floor for GSM receivers, meaning there is less space within the available band to send a clean signal. This sometimes results in dropped calls in areas where there is a high concentration of CDMA technology. Conversely, high powered GSM signals have been shown to cause overloading and jamming of CDMA receivers due to CDMAs reliance upon broadcasting across its entire available band. The result of this little cross broadcasting joust has led some cities to pass ordinances limiting the space between cell towers or the height they can reach, giving one technology a distinct advantage over the other. This is something to note when choosing a wireless provider. The distance between towers will severely affect connectivity for GSM based phones because the phones need constant access to the towers narrow band broadcasting. Popularity and Market Share. GSM is a lot more widespread in Europe and Asia. In the United States, Sprint and Verizon networks are CDMA whereas AT T and T Mobile are on GSM. Most of Europe uses GSM and so does China. In India, Hutch, Bharti and BSNL are on GSM whereas Reliance and Tata Tele are on CDMA networks. Shop For References.