Is THIS the cause of 3G signal issues?

Discussion in 'iPhone' started by dougas, Jul 29, 2008.

  1. dougas macrumors newbie

    Joined:
    Jan 8, 2008
    #1
    Anyone noticed that the iPhone 3G sim card tray is a really bad fit for most 3G sim cards?

    Here is a picture of mine...see how the sim chip doesn't clear the edge of the tray frame?

    Weird.
     

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  2. thor79 macrumors 6502

    thor79

    Joined:
    Jun 8, 2008
    Location:
    Chicago, IL
    #2
    I would think that it would either work or it does not...not in between.

    I would check to see what mine looks like but it's a pain in the butt to remove my phone from it's case.
     
  3. yode macrumors 6502

    Joined:
    Jul 29, 2007
    Location:
    Los Angeles
    #3
    how would the SIM card affect the physical antenna of the phone?
     
  4. Apple Ink macrumors 68000

    Apple Ink

    Joined:
    Mar 7, 2008
    #4
    All in all... about 18 access pins are a must for the sim to function properly. These are located in the three columns right in b/w the sim! The edges dont mater!
     
  5. DoFoT9 macrumors P6

    DoFoT9

    Joined:
    Jun 11, 2007
    Location:
    Singapore
    #5
    hes probably trying to indicate that the case wouldn't let a pure connection be established between the iphone and the simcard. i agree with thor that if its working then its working otherwise it wont be working...

    OP: its probably some other problem such as bad system country wide or simply not enugh bandwidth. or there could be some undercover operation which is interfering :p (i doubt that)
     
  6. thor79 macrumors 6502

    thor79

    Joined:
    Jun 8, 2008
    Location:
    Chicago, IL
    #6
    Yeah the 3G issues are probably just a bad network in most areas...the coverage maps show coverage...but it's probably only the most basic coverage resulting in extremely low signal strength.
     
  7. DoFoT9 macrumors P6

    DoFoT9

    Joined:
    Jun 11, 2007
    Location:
    Singapore
    #7
    yes great point, the signal is there but only strong enough to provide basic strength. possibly someone else could explain it in more detail haha.
     
  8. Rybold macrumors 6502a

    Rybold

    Joined:
    Jun 23, 2008
    Location:
    California, USA
    #8
    The SIM card and the antenna are completely unrelated functions. The antenna is a radio transceiver (transmitter and receiver in one) and sends and receives the radio waves. The SIM card is your user identification card. The SIM card, like your credit card or ATM card carries a serial number that identifies you to your wireless provider. SIM stands for "Subscriber Identification Module." Think of the SIM card as like a USB flash drive on your computer; it contains data. It is not an antenna or your internet broadband connection.
     
  9. DoFoT9 macrumors P6

    DoFoT9

    Joined:
    Jun 11, 2007
    Location:
    Singapore
    #9
    i think he knows that its not the antenna, i think he was more of the opinion that if the iphone has to 'wait' because of this SIM card case (be it the problem or not i doubt it).

    im not even 1% sure on this but if the SIM card has to be used to identify the phone on each send/request of data then it possibly could be a bottleneck.

    no idea though!!!
     
  10. iBrody macrumors 6502

    Joined:
    Jun 11, 2008
    #10
    The 3G and normal reception is far worse with the iphone on O2 than it was with my N95 on O2.

    My iphone fluctuates from one extreme to the other with the slightest movement. Very frustrating when taking a call (although a call hasn't dropped yet thank god).
     
  11. DoFoT9 macrumors P6

    DoFoT9

    Joined:
    Jun 11, 2007
    Location:
    Singapore
    #11
    maybe the antennas arent as good??
     
  12. JPIndustrie macrumors 6502a

    JPIndustrie

    Joined:
    Mar 12, 2008
    Location:
    Queens, NY
    #12
    I've got my first dropped call in like 2 years with the iPhone 3G. I really hope it's just a firmware issue. The last iPhone I had was pretty good on reception.
     
  13. sibruk macrumors 6502a

    Joined:
    Sep 17, 2007
    Location:
    UK+US
    #13
    I agree, I have been on O2 for years - 3G had much better coverage and always seemed faster in my last phone, a Sony Ericsson K800i. I think there is a problem with the iPhone. Hopefully it isn't a hardware thing and 2.1/2.0.1 will tweak the 3G reception and battery consumption.
     
  14. Rybold macrumors 6502a

    Rybold

    Joined:
    Jun 23, 2008
    Location:
    California, USA
    #14
    I sure hope so ! Even if it was a mild hardware issue, it's amazing what can be done with software tweaks. If a computer chip has a known flaw, the core software can be rewritten to access the chip in a completely different manner; restoring the observed performance to the end-user. Computer and electronics companies have been improving total overall performance of products for years with software modifications.
     
  15. n8236 macrumors 65816

    Joined:
    Mar 1, 2006
    #15
    I dunno if it's the SIM, but I did notice the SIM fitment into the little tray was a much tighter fit than my first gen. iPhone.
     
  16. imaketouchtheme macrumors 65816

    Joined:
    Dec 5, 2007
  17. maokh macrumors 6502

    Joined:
    Jun 9, 2007
    Location:
    Seattle, WA
    #17
    If the sim was a problem, you would see "Invalid SIM" ... this error message pops up when it cannot read the card. It will go from full signal to this you-cant-mistake-it state.

    Also, SIM cards are 8 pin, 6 are actually used. not sure where 18 is coming from.
     
  18. philly's finest macrumors newbie

    Joined:
    Aug 12, 2008
    #18
    found this on an at&t forum.....somone suggested putting a piece of scotch tape on the back of sim card to make it thicker thus putting more pressure against the connector.....as many of you probably think this is retarded, so did i, but it seems to have helped just a little and at this point i will take anything.....i normally get 1-2 bars at my office, now i get a solid 3, doesnt go up or down....could be just me, but lets see what happens if a bunch of us try this out......pass along the idea.....
     
  19. mavis macrumors 68040

    mavis

    Joined:
    Jul 30, 2007
    Location:
    Tokyo, Japan
    #19
    Wirelessly posted (iPhone 3G (16GB, 2.0.2 JB'd): Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_0_2 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5C1 Safari/525.20)

    I don't think it's "retarded" - it's just that what you're describing with the SIM card would have no effect WHATSOEVER on the iPhone's antennas.

    Correction: there is one possible effect. It's known as a "placebo effect" ... ;)
     
  20. kdarling macrumors demi-god

    kdarling

    Joined:
    Jun 9, 2007
    Location:
    Cabin by a lake
    #20
    SIMs are computers, often ARM based with hardware data encryption aids and a CRC calculator.

    For 3G, they're often used to authenticate the device and the network, and to en/decrypt data.

    So it's conceivable that a bad connection, or bad programming, could prevent the phone from getting onto 3G and/or being able to communicate.
     

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