1. F8ker8's Avatar
    I've started to receive error message ER01 "invalid certificate". With a red wifi calling symbol in the notification bar... This started 3 days ago.. I can still go online but can't text or call... T-Mobile tried to help but failed... What is the issue?

    Posted via Android Central App
    08-12-2014 03:26 PM
  2. Alexander Buff's Avatar
    I've seen that a few times. I have priorities set to use the cell network first, but it will pop up when there's no wifi near by. Only way to get rid of the message is to toggle wifi calling or restart the phone
    08-16-2014 06:01 PM
  3. Smply_Rcklss's Avatar
    Go to your T-Mobile my account & u have to change your update some information. Worked for me at least

    Tapatalk'n On The M8 ☕🐸
    08-16-2014 07:52 PM
  4. Griffin Walter's Avatar
    hi I found T-mobile site Wi-Fi Calling troubleshooting | T-Mobile Support

    This message displays when your phone is having trouble connecting to the Wi-Fi Calling service.
    You might see alternate versions of this error, such as:
    ER01
    REG01
    Invalid Cerificate
    To resolve this error, turn off Wi-Fi for 1 minute. Then, turn it back on and try to use Wi-Fi Calling. Visit the Phones page, and select your device. Look for Wi-Fi Calling to access guided steps. If you still see the error, contact T-Mobile Customer Service.


    I've started to receive error message ER01 "invalid certificate". With a red wifi calling symbol in the notification bar... This started 3 days ago.. I can still go online but can't text or call... T-Mobile tried to help but failed... What is the issue?

    Posted via Android Central App
    08-19-2014 09:24 PM

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