fatherfleming

Q: iPhone 4 loses signal when screen comes on

An iPhone 4 (A1332) has the following problem:

 

When you wake it (causing the screen to light up & come on) it shows full strength (all bars) in the upper left corner.

Over the course of a minute, the bars decrease until it says "searching" and finally "no service"

 

If you let the phone sit by itself for a few minutes and then pick it up again, the signal bars are back. But then they dwindle away again.

 

You can make a call if you dial it fast enough (before the signal bars disappear).

People have noted that they called me and it did not ring or go through.

 


What is the possible cause of this problem?

 

 

What I've tried: Contacted T-mobile several times. They assure their network is working fine. Others do not seem to have coverage problems in the same area.

 

iPhone 4

A1332

T-mobile SIM
Phone belongs to me.
Historically the phone has had no problems.

iPhone 4, iOS 7.1.2

Posted on Sep 3, 2014 11:20 AM

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Q: iPhone 4 loses signal when screen comes on

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  • Helpful answers

  • by norm123,

    norm123 norm123 Sep 5, 2014 7:16 AM in response to fatherfleming
    Community Specialists
    Sep 5, 2014 7:16 AM in response to fatherfleming

    Hello fatherfleming

     

    If you are having issues with service, then check out he article below for it dipping out and going to No Service.

     

    iPhone: Troubleshooting No Service

    http://support.apple.com/kb/TS4429

     

    If you encounter any of the above symptoms on your iPhone, follow these steps to try to resolve the issue. Test after each step.

    1. Toggle airplane mode: Tap Settings > Enable Airplane Mode, wait five seconds, then turn off airplane mode.
    2. Turn your iPhone off, then on again.
    3. Remove the SIM card and verify that it's a valid, carrier-manufactured SIM. Also verify that it isn't damaged, worn, or modified. Then reinsert it.
    4. Check for a carrier-settings update. Connect to a Wi-Fi network. Then tap Settings > General > About. If an update is available, iOS will ask you if you want to install it. If Wi-Fi isn't available, connect your device to iTunes.
    5. Update your iPhone to the latest version of iOS.
    6. Reset network settings by tapping Settings > General > Reset > Reset Network Settings. This will reset all network settings, including Bluetooth pairing records, Wi-Fi passwords, VPN, and APN settings.
    7. Restore the iPhone.

    If you're outside the United States, please also follow these steps:

    1. Go to Settings > Carrier > Automatic. 
If the phone registers any carrier network, Settings > Carrier will be present.
    2. If the Carrier option is missing in Settings and you're outside of the Unites States, please contact Apple for support and service options.
    3. Set the option for Automatic to off. 
A list of potentially available carriers appears after about two minutes. If the device is locked to a carrier, it may connect only to the carrier network to which it is locked. If the device displays carrier networks, then the device is working as expected.
    4. Set Settings > Carrier > Automatic back to on.

    If you're still experiencing No Service issues, contact your carrier to check for any network or account issues that could cause these symptoms.

     

     

    Regards,

    -Norm G.

  • by fatherfleming,

    fatherfleming fatherfleming Sep 5, 2014 6:05 PM in response to norm123
    Level 1 (0 points)
    Sep 5, 2014 6:05 PM in response to norm123

    Thanks. I've read and tried that. That comes up as a top result when you google this issue.

     

    I was thinking more along the lines of someone having specific information related to the idea that the signal fades when the screen comes on.

  • by norm123,

    norm123 norm123 Sep 16, 2014 10:25 AM in response to fatherfleming
    Community Specialists
    Sep 16, 2014 10:25 AM in response to fatherfleming

    Hey

     

    If it is still having issues and the article did not help, then I would recommend using another one of Apple Support resources.

     

    Contact Apple Support

    https://getsupport.apple.com/GetproductgroupList.action

     

    -Norm G.