what is the difference between gsm and gprs?which one is good?
472834
The Global System for Mobile Communications (GSM) is the most popular standard for mobile phones in the world. GSM service is used by over 1.5 billion people across more than 210 countries and territories [1]. The ubiquity of the GSM standard makes international roaming very common between mobile phone operators, enabling subscribers to use their phones in many parts of the world. GSM differs significantly from its predecessors in that both signaling and speech channels are digital, which means that it is considered a second generation (2G) mobile phone system. This fact has also meant that data communication was built into the system from very early on. GSM is an open standard which is currently developed by the 3GPP.\n\nGPRS (General Packet Radio Service) is the world's most ubiquitous wireless data service, available now with almost every GSM network. GPRS is a connectivity solution based on Internet Protocols that supports a wide range of enterprise and consumer applications. With throughput rates of up to 40 kbit/s, users have a similar access speed to a dial-up modem, but with the convenience of being able to connect from anywhere. GPRS customers enjoy advanced, feature-rich data services such as colour Internet browsing, e-mail on the move, powerful visual communications such as video streaming, multimedia messages and location-based services.
255636
The communication of signals is accomplished differently.   To allow many people to communicate at the same time, without interfering with one another, different modulation methods are used.  CDMA is "Code Division Multiple Access" and communication is separated by using different orthogonal code sequences. In both CDMA and GSM phones, your voice signal is first turned into a digital sequence of "1" and "0" symbols.  In CDMA, this sequence is convolved with a unique code (the spreading code) and sent using a large frequency space (bandwidth).  In TDMA (Time Division Multiple Access) which is the modulation format used in GSM phones, your digital sequence is sent without interference by sending your sequence at a time when other transmitters are not on the air.  In this way, GSM uses time, to temporally separate signals.  Both GSM and CDMA phones use multiple channels to further expand the number of users that can be 'on the air' without interfering with each other.  The use of multiple channels is called FDMA or Frequency Division Multiple Access.
751656
You can find all of the relevant standards for GSM and the WCDMA form of 3G on the 3G Partnership Project website at http://www.3gpp.org/specs/numbering.htm. For understanding selection of the base station, look at the 05.08 spec. under http://www.3gpp.org/ftp/Specs/html-info/05-series.htm. This applies specifically to GSM.\n\nIn general, GSM uses a form of ALOHA called "slotted ALOHA" to govern the random access portion of the network access initiation protocol.\n\nCheck out http://www.ee.surrey.ac.uk/Personal/L.Wood/constellations/tables/gsm.html for some overview on GSM. Also http://kbs.cs.tu-berlin.de/~jutta/gsm/js-intro.html.\n\nGoogle "GSM random access protocol" for more papers on Slotted ALOHA.\n\nGoogle "GSM network registration" or "CDMA network registration" for more on the process of finding and registering to the network.\n\nNote that CDMA comes in multiple forms, WCDMA being the 3G extension of GSM and CDMA 2000 being another variety. There may also be other varieties of CDMA...
880926
Yes it does. You will be charged for the amount of data you use when you are connected (assuming you are connecting over GPRS).  It may be a small amount per message but it could soon add up.
222831
Yes you can get this if you have GPRS and and a wireless connection for your cell phone
1007257
The SIM card for a GSM phone is actually a subscriber identity module. This card is used to store programming for the phone as well as user information such as phone book entries. The advantage of this is that the card can be transfered to another phone if needed.
645840
The GSM (and all other digital mobile) phones are encrypted with a split key. The Government has one half, and the service provider has the other. The two sections of the key are required to intercept communications on the phone, and the only way to get both keys together is with a court order, ie. a warrant.
262307
U can use a GPRS connection to connect to the internet, it will be provided to you by ur mobile service provider.... it will be the best way to connect to internet in this case....
5688
Google Talk is great.\n\nThe sound quality is great and the ease of use is even better. Google's take on VoIP - simple and useful.\n\nAlso, Google just released the API for GTalk so 3rd Party programs will start to appear making GTalk even more useful. \n\nFinally, since it is so small (less than a MB) go ahead and try it. It isn't meant to compete with AIM or MSN Messenger, instead use it for the great quality and ease of use.
23486
I would say BSNL is the best and most reliable provider in India. They have very good and prompt service and is available in most of India (unless you want it in some remote village). The service is called DataOne and has different options depending on your bandwidth and data transfer need.
483315
The only difference is the speed.  b does 11Mbps while g does 54Mbps.  They both operate on the same frequency and are compatible with each other.
81976
Depends on which type of connection u are using. If you are using the GSM service. Then you have to buy a GSM gateway which basically the GSM gateway will act like a Mobile Phone. \n\nAnd depends on which brand u are using . Most of them provide you with the complete coverage over their API.\n\n......\n\nAlso depends on what you try to do. Sending SMS by using Sim card connect to GMS gateway not the best option to send a bulk messages.  It is reliable at one level but once the traffic gets abit busy, then u realize the lack of services and SMS won't gets delivered or something. \n\ni guess you can buy bulk messages from services like \nclickatell.com\n\nThey provide you with a wide varieties of protocal and API to choose from. Either you wanna send SMS from .net application, web application, SMTP or FTP protocol they have it all .
31969
erm it's no different from the phone system with operating system install on it.\n\nit run on Sim Card and it connect you too SMS and free internet by WAP or what.
203395
cellular communications GSM and CDMA use different frequencies to operate\n\nGSM - 800 MHz, 850 Mhz, 900 Mhz, 1800 Mhz, 1900 MHz\nCDMA - dont recall but in the same set of freq's as GSM\n\nboth use a modified from of SS7 (Signaling System 7) to control the communications. and both are primarly for voice traffic\n\nThe range of a single cell site could be as high as tens of miles\n\nAll over the world you would need a license to set up a cellular tower\n\nWLAN on the other hand operates in the ISM Band\n\n802.11 b/g/n 2.4GHz\n802.11 a - 5.2 GHz\n\nthe WLAN is primarly used to transfer data, and the range of  typical WLAN installations with a single AP would be tens of feet. (although with the proper equipment one can do miles in point to point mode) The ISM band is also know as an amature band and almost all over the world you would not require any permission to set up equipment.\n\nHope this helps
6797
Becuase your mobile provider has to pay for a freqency range to use and generally mobile phones are used to recieve more than send. Also if you compare the size of the transmitter/arial and battery in your mobile to a base station transmitter you will see there are also physical reasons why you can't transmit faster.\nFor more details you should look into exactly what system your mobile uses GSM is a very wide-ranging term. You should look up technologies such as code division multiple access and the general packet radio service as well as comparing 2,2.5 and 3g technologies.
271711
There are two kinds of cellphones- GSM (Global System Mobile) and CDMA(Code Division Multiple Access). GSM SIM cards can be removed and installed in another GSM handset. \n\nCDMA phones dont have a similar SIM card, they are kind of hardwired. \n\nFind out if it is GSM, then u can do it.
250702
U can try checking with your mobile service provider. If they provide GPRS, all u need is a usb cable for the mobile phone and activate the GPRS for your mobile phone. I think that is what u can do if you dont have a telephone at home.