Question about Cell Phones

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Hi folks, I have a couple of small questions--and a big one. 1) What are the operating frequencies for Korean cellular providers, especially SK Telecom? 2) Are these monsters WCDMA, UMTS, HSDPA, 3G the same or different? 3) As I often travel between Europe and South Korea, I need to send and receive calls from both the CDMA and the GSM networks at the same time, wherever I am. Looks like what I need needs the operating frequencies: GSM 900 / 1800 / 1900 as well as WCDMA/UMTS/HSDPA 2100, also USA GSM frequencies like 850 / 1800 / 1900 would not hurt, but i can go without it. Moroever, a dual sim card phone with dual/simultaneous standby seems a must, and syncing with MS Outlook under windows XP and Vista should be part of the package, otherwise I have to export/import data all the time. What phone should I buy? Thanks in advance.

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  • Sunim Jun 27, 2008

    Dual sim dual standby is not there--and it is a must! Any other models you can suggest?

  • Sunim Jun 27, 2008

    Samsung SGH-D880 is only GPRS, not WCDMA/UMTS/3G, so it does not seem operational in Korea. Any other suggestions?

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4 Answers

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The best korean mobile is the N95 model, it is the best model in korean mobiles, you can buy that

Posted on Jun 27, 2008

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GSM and cdmaOne A are both 2G or second generation cellular system for carring voice and data, bot work on the same basics. If you wanna know more about this visit http://www.gsmworld.com in the history part.
TDMA or Time Division Multiple Access: a technology for delivering digital wireless service using time-division multiplexing. TDMA works by dividing a radio frequency into unique time slots and then allocating slots to different users (2 each). In this way, a single frequency can support multiple, simultaneous data channels. Mostly used in the Americas.
PDC is the same as TDMA but used as GSM cellular system.
W-CDMA and cdma2000 are both 3G or third generation of mobile communication. the improvements between the 2G and 3G are better voice quality and a bigger bandwith, IP traffic, greater capacity and improved spectrum and better roaming
UMTS or Universal Telecommuncation System is commonly used alongside the term 3G in Europe. This can be confusing however, as UMTS refers to a specific implementation of WCDMA within the 2.1GHz band which is the frequency that is made available for 3G in Europe and other parts of the world. It is an implementation of 3G
the follow up of technologies are going to be
- cdmaOne -> cdma2000 1x -> cdma2000 1x EV-DO or EV-DV
- TDMA to cdma2000 1x or to GSM (most will use GSM)
- GSM -> GPRS -> EDGE -> W-CDMA
So you are going to have 2 systems CDMA2000 and WCDMA

Posted on Jun 27, 2008

  • 1 more comment 
  • sharad srivastava
    sharad srivastava Jun 27, 2008

    DATA for GSM

    WAP or Wireless Application Protocol: a protocol to discribe how data is send and transmitted to a mobile phone.

    GPRS or General Packed Radio Service: is a packet based technology for data transfer over an IP-based network and used as an enhancement for GSM networks, The speed of a GPRS capable device depends on how many timeslots (1 to 8, shared by active users) within a TDMA frame are used. Up and downlink are treated separately and various radio channel coding schemes allow bitrates from 9 to over 171.2 kbit/s (if device were to use all 8 channels without error correction) per user

    HSCSD or High Speed Curcuit Switched Data: is an enhancement of current GSM networks allowing users to send and receive data with higher speeds. This is achieved by increasing the speed of one channel as well as giving the option of using several channels at the same time, which results in speeds close to 60 Kbps. This makes HSCSD particularly interesting to people who want to access the Internet at higher speeds than current GSM phones.

    EDGE or Enhanced Data rates for Global Evolution (EGPRS): EDGE is being developed to be the basis for a 3G wireless standard which can be used by TDMA and GSM operators. It works with a new modulation technique which allows for better usage of existing frequencies. This means that EDGE can be deployed on existing GSM networks. EDGE enables data transfer speeds of up to 384 kilobits per second. This translates to 48 Kbps per timeslot enabling three times the data speeds of GPRS.

    WCDMA or Wideband Code Division Multiple Access is a 3G technology used in UMTS. Data transfer speeds go up to 2 Mbps, and due to the efficient use of the radio spectrum, a wealth of different services can be accessed simultaneously including circuit and packet services with varying bandwidths. WCDMA data transfer speeds will go up to 10.8 Mbps.

    HSDPA or 3.5G, not much is know about it, but this will be the GPRS of a 3G network, in run up to the 4G network, but this is future talk, not before 2010...



    DATA for CDMA2000

    cdma2000 is an IMT-2000 standard and included in the evolution part from cdmaOne.

    cdma2000 1x will double the voice capacity and allow up to packet-based data transfer speeds of up to 307 Kbps.

    cdma2000 1xEV, the next step, will allow for up to 2.4 Mbps data transfer rates (1xEV-DO, data only) and 4.8 Mbps in phase 2 (1xEV-DV, data and voice).

    WML or Wireless Markup Language: a markup language based on XML. it a browser context how text and images will be showed on a small screen device.
    XHTML is a more advanced Markup Language.

    Push to Talk
    A one-way communication function in a mobile phone which lets one user at a time talk to another user or a selected user group. Push to talk is activated by pressing the push to talk key or equivalent on the phone. In a user group, the turns to speak are requested by pressing the push to talk key and granted on a first come, first served basis.

    Push to Talk over cellular
    A service that provides direct one-to-one and one-to-many voice communication in the cellular network. Calls can be started both to individuals and to talk groups with just the push of a key. Call connection is almost instantaneous and the receiver does not have to answer the call. A specifically PoC-enabled terminal is needed for the service.

  • sharad srivastava
    sharad srivastava Jun 27, 2008

    Connection technologies

    Radio frequency Bands;

    The RF Spectum extends from 3kHz to 300GHz. The most important are those (for this subject)
    these bands are unlicend:

    The 2.4 - 2.5 GHz for IEEE 802.11b, Bluetooth and Home Cordless phones and microwave ovens
    And the 5Ghz for IEEE 802.11.

    Bluetooth
    A wireless interconnect technology standard, designed to replace the many cables we need to connect devices. This technology will let you walk into a room and communicate with your PC or other Bluetooth-compliant devices. The Bluetooth specification was created in February 1998 by a consortium comprising inventive minds from Ericsson, IBM, Intel, Nokia and Toshiba
    The odd name is derived from an aggressive Viking king so fond of blueberries that they stained his teeth.
    Bluetooth is a good, low-power data/voice transmission standard that will be a real boon for certain applications. Imagine a cell phone or pager that automatically transfers to vibrate mode when you enter a restaurant or theater. Or a laptop and GPS (global positioning system) that automatically feed a display in your car for directions. One of Bluetooth's design strengths is its low cost. The Bluetooth SIG says integrating this technology should add only $5 to the cost of a unit.
    Bluetooth operates in the 2.4 Ghz band and got 3 power classes:
    Class 1: 100 milliwatt, 20 dBm, 1Mbs, 100 Meters
    Class 2: 2.5 milliwatt, 4 dBm, 1Mbs, 10 Meters
    Class 3: 1 milliwatt, 0 dBm, 1Mbs, 10 Meters
    The speed of 1Mbs and the distances are under optimal conditions, normaly a speed of 700-800 Kbs is more likely
    Bluetooth traffic has 2 types; Voice and data. Voice traffic has a much lower tolerance for interference than does data traffic.

    The security of the bluetooth network is less than wonderful. You have 3 types;
    Level 1: No security.
    Level 2: Service-level-enforced security. Security is established after channel negotiation.
    Level 3: Link-level-enforced security
    The second level is the most used.
    and for those who wanna know;
    there are 5 stages of activity of a bluetooth network: standby, inquire, page, connect and park/hold.
    Standby is a radio waiting to join a piconet (PAN).
    Inquire is a radio seeking other radios to connect.
    Page is a master radio asking to connect to a specific radio.
    Connect is a radio active on a piconet as a master, slave or simultaneous.
    Park/hold is a low-power connected state.

    IEEE 802.11a, b, g,... or WIFI
    Wifi is much more faster than Bluetooth with speeds up to 11-54 Mbs and a operation range of 400 meters.
    There are some basic differences between. Bluetooth is designed for connecting 2 or more devices for sharing data and voice and Wifi is more designed to connect a whole network.

    the standards from a to g are updates on speed and security;
    802.11a
    An IEEE specification for wireless networking that operates in the 5 GHz frequency range (5.725 GHz to 5.850 GHz) with a maximum 54 Mbps data transfer rate. The 5 GHz frequency band is not as crowded as the 2.4 GHz frequency, because the 802.11a specification offers more radio channels than the 802.11b. These additional channels can help avoid radio and microwave interference.
    802.11b
    International standard for wireless networking that operates in the 2.4 GHz frequency range (2.4 GHz to 2.4835 GHz) and provides a throughput of up to 11 Mbps. This is a very commonly used frequency. Microwave ovens, cordless phones, medical and scientific equipment, as well as Bluetooth devices, all work within the 2.4 GHz frequency band.
    802.11g
    Similar to 802.11b, but this standard provides a throughput of up to 54 Mbps. It also operates in the 2.4 GHz frequency band but uses a different radio technology in order to boost overall bandwidth.

    WIMAX or Super WIFI
    Wimax is a technologie that allows to provide internetconnection of a hole city. It has a speed of 70Mbs and it can carry signals over distances of 50Km. This a direct threat to the 3G network althow it can't carry voice, it can be used for VOIP (voice over IP). This technologie is just in developing fase and will be available at the beginning of 2005.

    IR of Infrared
    Infrared uses the invisable red light to communicate with devices. it need a staight line up between transmitter and reciever within 1 meter. The speed can go up to 4Mbs (high speed infrared connection) but normaly with mobile phones the speed is not more then 115Kbs.


    Did you know?
    that grounded metal sheets absorb the RF signals (cookie sheet, large metal bowl, metal wall studs, metal sheeting, ceiling tiles, etc.)
    Also Microwave ovens can interfere with the bluetooth or Wifi RF.

  • sharad srivastava
    sharad srivastava Jun 27, 2008

    And at last after researh I seek these model for Nokia Supernova 7610, 7510, 7310 and 7210 you can choose any one .

    Regards:

    sharad

    "plz dont forget rate it"

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HeHi folks, I have a - d880.jpg The Samsung SGH-D880 is a revolutionary mobile phone incorporating two separate SIM card slots and Dual Active Standby connectivity that enable users to enjoy a hassle free mobile experience along with the functionality of two phones in one sleek unit.

Ultimate Dual-Line Freedom
Users can activate both SIM cards simultaneously and effortlessly to receive calls and SMSes on either one. Connectivity is enhanced as the SGH-D880 user can be served by two networks at any one time. The perfect companion for multi SIM users such as frequent travelers and business professionals, the slider eliminates the need to carry multiple handsets.

Exquisite Design
Boasting a shiny and reflective mirror-like surface, the sleek and stylish phone sets a sophisticated and professional look that is further enhanced by its large 2.3” wide TFT display.

Outstanding Battery Life
The SGH-D880 incorporates a large battery that offers superior standby time of up to 360 hours
High Megapixel Camera with Auto Focus
It also features an embedded 3 Mega-pixel camera with Auto Focus, and a CMOS sensor to capture high quality, razor-sharp images when traveling or at play.
Integrated Mobile Entertainment Options
A portable jukebox that plays music files in MP3, AAC+, WMA formats, the SGH-D880 also comes with FM Radio and Bluetooth 2.0 functionalities.

Availability and Pricing
The Samsung SGH-D880 has a recommended retail price of RM 1,799.00 (USD 549) and is now available in stores.
THIS IS THE MOBILE I SURELY THINK WILL HELP U. THANK YOU!!! please rate the solution.

Posted on Jun 27, 2008

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  • 638 Answers

LG cu500 is the olly model i feel u should buy .it has everything u want.
feel free 4 further assistance .rate the particular experts solution as fixya that helps u understand n solve ur problem

Posted on Jun 27, 2008

  • 2 more comments 
  • hemant somaiya
    hemant somaiya Jun 27, 2008

    all the features n facilities covered in 1 phone.its just the best.

  • hemant somaiya
    hemant somaiya Jun 27, 2008

    rate this solution as fixya .n enjoy ur work with ur new phone

  • hemant somaiya
    hemant somaiya Jun 27, 2008

    any more information u require plse feel free to ask.n dont forget to rate this solution.thanks in advance

  • hemant somaiya
    hemant somaiya Jun 27, 2008

    Nokia supernova 7610, 7510, 7310 and 7210 are the ones that meet ur requirements.

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To my knowledge, there are two cellular service providers in Fiji. Both operate on the 900MHz band for cell phones. As you didn't include the name of your cellular service provider, I can't tell you whether they have roaming agreements in Fiji (If you are just visiting and have service in another country.)

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