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Discuss If EDGE is connected -> No phone calls!! ?????? at the General - Hackint0sh.org; Originally Posted by bence8810 Okay, thats close to where I am, and I am sure ...
  1. #21
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    Quote Originally Posted by bence8810 View Post
    Okay, thats close to where I am, and I am sure most EU mobile service providers are on a pretty similar standard.
    GSM is a worldwide standard. There are 4 different frequency bands (850MHz, 900MHz, 1800MHz and 1900MHz) in use, so you need a quad band to get RF-reception in all countries all over the world. But as soon as you get RF-reception, the standard for the baseband is the same in all GSM networks. Same for the data transmission via GPRS and EDGE (Enhanced Datarate for GSM Evolution), which is an evolution of the GPRS standard (it's actually a different modulation for the RF signal which gives the higher data rate).

    Quote Originally Posted by bence8810 View Post
    What happens when you have your Voice mail turned off? The call comes in and the EDGE is dropped? That is how it should work but most handsets lets you choose this as an option.
    GPRS and EDGE is only using the parts of the network infrastructure which is not used by voice. A GSM transmitter shares one frequency (BCCH) between eight different mobiles (phones) by splitting the signal into 8 time slots - and reserving one timeslot per mobile. As a GSM base station (the tower) supports 3 to 10 different frequencies - and the mobiles can change the frequency on the fly, between 24 and 80 simultaneous calls can be handled by one BTS. If not all channels are used by voice, they are used for GPRS or EDGE. As soon as another channel is needed for voice, the number of GPRS/EDGE-channels is reduced. If a BTS is fully occupied by voice calls, GPRS/EDGE slows down or stops completely. On the other hand the connection speeds up if voice calls are terminated and the channels not used anymore.

    Hope this explains a little bit how GSM and GPRS/EDGE are interacting in the network. So if the iPhone didn't receive calls while having a GPRS/EDGE-connection established, most likely something in the network failed - or the BTS was completely occupied.


    cu/

    Sergeij


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    Quote Originally Posted by guenther_78 View Post
    I'm on Vodafone in germany, and no call's coming through when using google maps or checking my mail for example. No call. Everything goes straight through to the mailbox.

    The Nokia N95 i used before (and eventually will be using AGAIN) always paused any data connection when a voicecall arrived. So, it doesn't seem to be a network problem per se...
    Might be a problem with Vodafone, because i have no problems with T-Mobile when downloading mails, using Google maps or watching a YouTube video.

    Ich habe es gerade noch einmal probiert

    cu/

    Sergeij

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    I'm in ATT, US. Same problem here.

    I think this should probably be related to call forwarding options.

    There's a call forwarding option that forwards all call when the phone is doing data transfers.

    I think that must be activated in phones that have this problem.

    iPhone doesn't allow you to configure all call forwarding options though the interface, and I don't remember right now the keypad codes.

    If any of you has access to a different headset (or know the codes) try to check that out to see if that the case.

    []'s


    Edit: Never mind, just checked that out. It is all fine.


    Brasuco.
    Last edited by brasuco; 09-04-2007 at 06:11 PM.

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    Quote Originally Posted by brasuco View Post
    I'm ATT, US. Same problem here.

    I think this should probably be related to call forwarding options.

    There's a call forwarding option that forwards all call when the phone is doing data transfers.

    I think that must be activated in phones that have this problem.

    iPhone doesn't allow to configure all call forwarding options though the interface, and I don't remember right now the keypad codes.

    If any of you has access to a different headset (or know the codes) try to check that out to see if that the case.

    []'s


    Edit: Never mind, just checked that out. It is all fine.


    Brasuco.
    Here is a web site listing the GSM codes to modify the behaviour of the mobile - and to change the call forwarding:

    > http://web.telia.com/~u47904776/gsmkode.htm

    Search for the Call forwarding/diversion section. Use the codes like an ordinary phone number, e.g. punch it in and hit the dial button.

    Dialling *#21# checks the status of the divertions. As you stated correctly in your posting, you can set several different diversions for different services.

    cu/

    Sergeij

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    Code:
    Dialling *#21# checks the status of the divertions.
    You need to send the call at the end, its not automatic like checking the IMEI, etc. So *#21# and Dial

    Ben


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    Quote Originally Posted by bence8810 View Post
    Code:
    Dialling *#21# checks the status of the divertions.
    You need to send the call at the end, its not automatic like checking the IMEI, etc. So *#21# and Dial

    Ben
    Thanks for the clarification, bence8810. There are indeed some dial codes, which are directly intercepted by the modem, like *#06# for the query of the IMEI, and the (still unknown) code for the removal of the SIM-lock

    cu/

    Sergeij

 

 
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