The difference between GSM and CDMA is that GSM cell phones have a SIM card slot, while CDMA cell phones do not. The technical difference between a GSM network and a CDMA network has to do with the way your data is converted into radio waves. Gsm and CDMA are simply a name for the technology used in phone systems.
Both GSM and CDMA technology were introduced for 2G phones. The maximum speed of 2G technology is 1 Mbps. 3G phones use UMTS , while 4G Phones use LTE and the Latest 5G uses Mimo MM waves.
The programming differences between GSM and CDMA phones are subtle and complicated. The main differences are: GSM has been around longer and is more widely accepted. In most countries, GSM networks are far more common than CDMA networks.
The difference between CDMA and GSM is not relevant anymore as in 2021 as most network providers have migrated to new network technology. Network carriers have migrated to UMTS, LTE and Mimo technology while some networks still rely on GSM and CDMA for voice calls in certain areas.. CDMA and GSM should not be a consideration when deciding on a new network provider in the year 2021. The choice to consider is between LTE and 5G coverage.
What is GSM?
GSM is the mobile phone technology that stands Global System for Mobile Communications. GSM cell phones have SIM card slots.
What is CDMA?
CDMA is the mobile phone technology that stands for Code-division multiple access (CDMA). CDMA cell phones do not typically have sim card slots.
What are the advantages of using a GSM Network?
There are several advantages to using GSM over CDMA:
- GSM is far more widely accepted In most countries
- GSM makes roaming between GSM networks much simpler.
What are the advantages of using a CDMA Network?
There are several advantages to using CDMA over GSM:
- CDMA is much more power-efficient
- CDMA allows more users per frequency band.
- CDMA can use more than one antenna for maximum reception In the U.S
What are the CDMA Carriers in the US?
Here is a list of CDMA network providers in the US:
- U.S. Cellular
- C Spire wireless
What are the GSM Carriers in the US?
Here is a list of GSM network providers in the US:
What countries still use CDMA networks:
Here is a list of countries still use CDMA networks in 2021:
- United States
- South Korea
Are iPhones CDMA or GSM?
Apple makes both GSM and CDMA iPhones, but they are all programmed differently. When you purchase an iPhone from AT&T or T-Mobile, it will work with their network. However, if you purchase an iPhone from another carrier, it will NOT work with their network.
What is a SIM Card?
SIM stands for Subscriber Identity Module and is a credit card size plastic device that is used in GSM phones to store information about the phone subscriber and their account.
Do CDMA networks use SIM cards?
Yes, all CDMA phones in 2021 use SIM cards however technically sim cards are not required for CDMA however along with CDMA network providers also use use LTE 4G technology where sim cars is required.
Do GSM networks use SIM cards?
Yes all GSM networks use sim cards. A sim card is required for a GSM phone to function properly.
What About 5G?
In addition to CDMA and GSM, we now have LTE, WiFi, Bluetooth, NFC and others. 5G is the next generation mobile phone technology. It is based on an entirely different set of physical principles than 4G. It has the potential to provide speeds up to 1,000 times faster than 4G. But 5G is not widely used yet. Most people are still stuck on 4G. And 4G is far more than enough for most people. Even though 5G has been around for more than a decade, there are only a handful of 5G compatible phones available today.
In 2021 the debate over GSM vs CDMA is no longer relevant as these are old technologies that are used today only for voice calls and basic features. For high speed mobile data, UMTS, LTE and 5G technologies have now replaced GSM and CDMA tech.