GSM stands for Global System for Mobile communications standard for mobile phones, which came into force in mid-1980th GSM operates in the 900 MHz and 1800 MHz in Europe and India in the 1900-MHz U.S. users tend to use GSM SIM cards in order to connect Service Providers in touch. The SIM cards are small, removable storage media that all data and numbers of the need, a provider of wireless services can have access. GSM operates on the basis of TDMA, which assigns a certain time at a certain frequency. GSM systems are more secure than CDMA because of its mode of action is one of her classes.

What is CDMA?

CDMA technology means that the code division multiple access, the completely different than GSM or TDMA. In CDMA, the signal is digitized by the first voice and distributes the resulting data over the wide frequency band. CDMA is a form of spread spectrum, which clearly means that the data is sent in small pieces over a number of discrete frequencies available at any time in the specified interval. Furthermore, CDMA systems, both 800 MHz and 1900 MHz frequency bands.

Advantages of GSM:

-> A variety of phones and service providers available to choose from.
- Costs for calls> More and more each day.
-> The quality is relatively safe and well in GSM.
- Value is always’ more by services such as GPRS, EDGE, etc. were added to these
-> Energy consumption is lower than in GSM mobile phones in CDMA phones in comparison.
- May have> Who a GSM tri-band used almost anywhere in the world.

Disadvantages:

-> Cost of GSM roaming calls are even larger than CDMA.
-> GSM mobile phones are fully tested and can not be changed.
-> There is no way to lose lose all your data if the SIM card if they are not stored in phone memory.

Benefits of CDMA:

-> One of the largest CDMA is the cost of calls is cheaper than GSM.
-> From now on, the quality is better than GSM.

Disadvantages:

-> No availability of a variety of devices on the CDMA as in the case of GSM customers.
-> You are not compatible with GSM phones.
- Is> Another disadvantage is that there are only 2 CDMA provider has on their behalf and consumers have no choice, if a lower level of service.
-> CDMA services have options for Web services such as messaging, downloading ringtones from websites, etc..