Tips Searching for GSM signal?

Discussion in 'Android Devices' started by phalcon, Jun 11, 2010.

  1. phalcon

    phalcon Active Member
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    Jun 1, 2010
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    I'm not sure if this has been posted here yet, but I found this interesting. A friend of mine is a member of the EVO Facebook group and sent me to a link which reads as follows:
    "For those of you having battery issues I found a way to DRAMATICALLY improve the battery life.
    First things first, go into Settings> About Phone> Battery> Battery Use> Cell Standby. Assuming your phone has been on, or off the charger for ~10 minutes, it should show Time Without Signal at around 50%.

    Next thing, press HOME, and bring up the dialer. Dial *#*#4636#*#* (Do not press "Call"). After a second, it should bring up the "Testing" menu.

    Go into Phone Information, press MENU, and tap "select radio band." You should experience a Force Close, don't panic, this was supposed to happen. Scrolling down shows that the preferred network type is GSM auto (prl).

    What this means is that even though you are connected to a CDMA network, your phone is trying to find a GSM network, preventing the radio from sleeping, and causing excessive battery drain.

    Remedy this by tapping GSM auto (prl), and changing it to CDMA auto (prl).


    Now your done, your TWS should drop dramatically, and you should experience much better battery life!

    Note: You need to do this every time you reboot."


    I've changed it on my phone just now, and the service still works as normal. I guess we'll see if the battery life increases. If this works and with overclock widget I should be getting some crazy battery life now!
     

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  2. ekt8750

    ekt8750 Well-Known Member
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    That is a great find. One would think the factory default for a CDMA phone would be set for CDMA prl but I guess I need to stop using logic.
     
  3. camdz

    camdz Well-Known Member
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    I get "The process com.android.phone has stopped unexpectedly. Please try again."

    This happens as soon as I select radio band.
     
  4. coolguy949

    coolguy949 Well-Known Member
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    Jun 5, 2010
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    That's normal
     
  5. camdz

    camdz Well-Known Member
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    Then how would I get to the option to change GSM auto to CDMA auto?
     
  6. coolguy949

    coolguy949 Well-Known Member
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    After you select the option, it will force close. Give it several seconds and the menu will pop up. You'll see GSM is set by default. switch it to CDMA auto (PRL) and hit the back button all the way back your dialer.

    Rebooting will wipe out the setting.
     
  7. camdz

    camdz Well-Known Member
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    Oct 18, 2009
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    Ah, thanks! I guess I should have tried scrolling down.
     
  8. mark0695

    mark0695 Member
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    Dec 24, 2009
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    york, pa
    ive rebooted and it still has stayed on cdma
     
  9. coolguy949

    coolguy949 Well-Known Member
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    It shows the same when you click "select radio band" in the menu?
     
  10. mark0695

    mark0695 Member
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    Dec 24, 2009
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    correct. cdmal prl is staying the same even after multiple reboots
     
  11. coolguy949

    coolguy949 Well-Known Member
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    Are you rooted?
     
  12. mark0695

    mark0695 Member
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    no not at all. havent even tried to root
     
  13. coolguy949

    coolguy949 Well-Known Member
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    Jun 5, 2010
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    Interactive and Social Marketing
    Orange County, CA
    Very interesting. Mine doesn't stick. Now i'm thinking it's never actually applying a change because I haven't noticed any better battery life.
     
  14. mark0695

    mark0695 Member
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    Dec 24, 2009
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    :)

    i havent notice anything better battery wise either but it was worth a shot
     
  15. phalcon

    phalcon Active Member
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    Jun 1, 2010
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    I only posted this a few hours ago, so it's really a bit early to tell if this actually does any good. I won't know for sure until tomorrow around this time what the outcome is.

    Edit: Also, you'll know if it's working if your "Time without a signal" percentage decreases after a few hours use (make sure it's not plugged in).
     
  16. mark0695

    mark0695 Member
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    Dec 24, 2009
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    i did this yesterday morning or afternoon from someone elses post that linked to xda. also my down time was 0 in the first place so i probably wont see any difference
     
  17. Mabster

    Mabster Well-Known Member
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    May 26, 2010
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    You can also download the app "NETWORK" so you don't have to do the whole *#*#blah part. It takes you directly to the phone info page.
     
  18. phalcon

    phalcon Active Member
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    Jun 1, 2010
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    Brooklyn, NY
    Ahh, my bad. I'm hoping to see a difference, though with overclockwidget running I've already seen a significant increase in battery life. Just figured I'd give this a try. Couldn't hurt. The friend who showed me the link had a TWS of 88%, but he gets a really crappy signal in his apartment. Gonna ask him later tonight if that percentage has changed any.
     
  19. sitlet

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    Apr 11, 2010
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    I'm pretty sure this phone doesn't have a GSM radio, so it's not really searching for a gsm signal.
     
  20. phalcon

    phalcon Active Member
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    Jun 1, 2010
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    Do CDMA and GSM use different radios? I thought they just used different frequencies and protocols and that the type of radio was irrelevant.
     
  21. FLEMTP

    FLEMTP Well-Known Member
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    Jun 5, 2010
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    hmm i checked that out.. time without a signal is 8%. Phone has been off the charger 14hrs 10 min since unplugged...battery is at 51%... id say im doing pretty good without the change you suggested.
     
  22. phalcon

    phalcon Active Member
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    Jun 1, 2010
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    Brooklyn, NY
    One thing I've noticed about all of these "solutions" for how to improve battery life is that they're all pretty evenly split among those who swear there is an improvement after they've applied fix "X" and those that swear that fix "X" doesn't work at all. I think given the variations of how we all use our phones, apps we have installed and numerous other factors we'll never really come to a consensus on whether fix "X" will improve your battery life. Frankly, I'm just the sort that likes to tinker and see what happens. As with all posts offering suggestions on how to improve one's battery life this one carries a big YMMV.
     
  23. Roadblock

    Roadblock Well-Known Member
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    Jun 1, 2010
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    Here is what I can throw in about this.

    I snagged the app "Network" and changed my phone from "GSM auto (PRL)" to "CDMA auto (PRL)" and idle usage is WAY WAY down.

    Taken from another post I made in another thread...

     
  24. Roadblock

    Roadblock Well-Known Member
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    Jun 1, 2010
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    Here is what I can throw in about this.

    I snagged the app "Network" and changed my phone from "GSM auto (PRL)" to "CDMA auto (PRL)" and idle usage is WAY WAY down.

    Taken from another post I made in another thread...

    Someone else basically just told me I was full of crap and HTC would NEVER let there phones out like this. Not sure what to say but ummmmm yeah, it's working for me.
     
  25. dohmai

    dohmai Well-Known Member
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    Apr 30, 2010
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    Question about the GSM to CDMA switch...

    I get through the menu/switch radio band/force close.. then can switch to CDMA auto prl in the dropbox...

    But then when I exit to home or back button and go through process again to 'check' if the change has taken place (settings/switch radio band/force close) .. it shows up as GSM auto prl again..

    Is this supposed to happen, or am I somehow not 'confirming' my switch to CDMA.. and how can I do that? I've just been going 'back' to home screen.

    Also where can I view Time without signal statistics?

    Thanks
     
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