What is diff betn GPRS, GPS,CDMA?What they stand for?providers of sim mobile card card uses which one & why?

Answer 1

The diff between the systems you listed is the technology used in both the phones and towers in your area basically it can be broken down into CDMA or (Code Division Multiple Access) and GSM (Digital).

To get technical the difference is the way both systems work

GSM uses TDMA (Time Division Multiple Access) -which does it by chopping up the channel into sequential time slices. Each user of the channel takes turns to transmit and receive signals. In reality, only one person is actually using the channel at a specific moment. This is analogous to time-sharing on a large computer server.

CDMA (Code Division Multiple Access) - underlying technology used in GSM's 3G and CDMA 2G) on the other hand, uses a special type of digital modulation called spread spectrum which spreads the voice data over a very wide channel in pseudorandom fashion. The receiver undoes the randomization to collect the bits together and produce the sound.

As a trivial comparison imagine a cocktail party, where couples are talking to each other in a single room. The room represents the available bandwidth. In GSM, a speaker takes turns talking to a listener. The speaker talks for a short time and then stops to let another pair talk. There is never more than one speaker talking in the room, no one has to worry about two conversations mixing. In CDMA, any speaker can talk at any time; however each uses a different language. Each listener can only understand the language of their partner. As more and more couples talk, the background noise (representing the noise floor) gets louder, but because of the difference in languages, conversations do not mix.

GPRS is a data network that allows users to access internet services on the move including wireless email, PXT™, access to WAP and web content, instant messaging.

Global Positioning System (GPS) is navigation system that works via the couple dozen sattilites orbiting the world that may be integrated into some phones.


Which one would suit you all depends on a number of things

-which system operates in your area
-what you want from your phone
-and lastly when is the 3g system being fased in where you are.

Hope all that helps if you need more just search the internet its a wealth of information

For more detailed information visit http://www.wisegeek.com/what-is-the-difference-between-gsm-and-cdma.htm

Answer 2

you can go for a bigggggggg answer but in nut shell the meaning is:
gprs:General Packet Radio Service (GPRS) is a mobile data service available to users of GSM .GPRS data transfer is typically charged per megabyte of transferred data. GPRS can be utilized for services such as WAP access, SMS and MMS, but also for Internet communication services such as email and web access

gps:The Global Positioning System (GPS), is currently the only fully functional Global Navigation Satellite System (GNSS). More than two dozen GPS satellites are in medium Earth orbit, transmitting signals allowing GPS receivers to determine the receiver's location, speed and direction.

cdma:Code division multiple access (CDMA) is a form of multiplexing and a method of multiple access that divides up a radio channel not by time (as in time division multiple access), nor by frequency (as in frequency-division multiple access), but instead by using different pseudo-random code sequences for each user. CDMA is a form of "spread-spectrum" signalling, since the modulated coded signal has a much higher bandwidth than the data being communicated

Answer 3

Yeap. Sprint and Verizon uses CDMA network which do not use sim cards. However there are some smartphones for Verizon that have a sim cards. Virgin Mobile and Boost Mobile phones do not use any sim cards at all. They also use CDMA network.