Buzz
A noticeable trend is when traveling to European countries, where all mobile devices support GSM networks. In contrast, when in the United States, devices need to support both CDMA and GSM networks for telecommunications access.
Not to mention, you might have come across ads for unlocked Android, iPhone, iPad supporting both CDMA and GSM networks. Even when checking the origin of iPhones and iPads, this difference is apparent. So, what's the reason behind this discrepancy?
Decoding Differences: CDMA versus GSM
* Overview of CDMA and GSM
CDMA and GSM stand as prevalent telecommunication standards globally. Some countries exclusively adopt GSM or CDMA, while others utilize both standards. Each communication standard employs distinct spectrum technologies, leading to operational disparities.
In Vietnam, GSM is the prevailing standard adopted by major networks such as Viettel, Mobifone, VinaPhone, and Vietnammobile.
* Understanding CDMA
CDMA, short for 'Code Division Multiple Access,' employs wideband spectrum technology, enabling the seamless transmission of multiple signals and information through a single channel.
With CDMA networks, providers rely on a specific list to detect their subscribers within the coverage area and do not issue SIM cards on phones. Switching SIM cards with CDMA networks is challenging for users, as they must use a different phone approved by the network that supports CDMA.
If approved, the process of transferring subscriber information from the old to the new phone is also quite intricate.
However, in recent times, many networks have also begun to support CDMA devices with integrated SIM slots for using 4G LTE networks, serving high-speed web browsing and calls in countries using GSM networks. Currently, Vietnam is actively supporting the deployment of 4G networks for all major carriers. Users can subscribe to 4G services from Viettel, VinaPhone, Mobifone to experience high-speed mobile networks. Note that after registering for 4G with Viettel, Mobifone, VinaPhone, it's crucial to thoroughly research 4G packages to avoid inadvertently subscribing to plans exceeding personal needs.
* Understanding GSM
GSM, short for 'Global System for Mobiles,' utilizes sharp continuous spectrum technology, allowing the separation of each time frame for every subscriber, thereby preventing interference. In GSM networks, information resides on the SIM card. If you want to use a different phone supporting GSM, you will need to switch to another SIM card.
* Distinctions between CMDA and GSM
Hence, the distinction between CDMA and GSM is quite evident:
- Changing subscriber information is challenging in CDMA, whereas GSM only requires a SIM swap to modify subscriber details.
- CDMA is less prevalent, while GSM enjoys widespread popularity globally.
- Most CDMA devices lack SIM slots, whereas GSM devices come equipped with SIM slots.
- CDMA offers higher transmission speed and data capacity compared to phones supporting the GSM standard.
- CDMA 3G networks cannot simultaneously transmit data and make calls. This means you cannot turn on 3G for internet use while making a call. However, with GSM devices, this is possible.
Conclusion
After distinguishing CDMA and GSM, as well as comparing the two, readers undoubtedly have gained knowledge about current telecommunication standards. Each network standard has its distinct advantages and disadvantages, making it relatively easy to differentiate between CDMA and GSM.
Distinguishing between CDMA and GSM, especially when aware of the pros and cons of each network standard, allows users to easily choose devices according to their preferences. For instance, you cannot use CDMA networks in Vietnam, and when in the United States, you have two choices for network usage, including GSM and CDMA. Furthermore, with the flourishing market of imported Android and iPhone devices, understanding the differences between telecommunication standards enables you to select the best device for your needs.
Wishing you all success!
