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Thread: How to fix error “Device not recognized” on T-mobile Device Unlock app for Android

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    How to fix error “Device not recognized” on T-mobile Device Unlock app for Android


    If you want to unlock a new T-Mobile Android Device, you will find out that it will no longer ask for unlock code when turning on with a sim from a different carrier like it did for older devices, or like other android phones do. There is a new method through an android application preinstalled by T-Mobile called the Device unlock app. So if you have a T-Mobile new Android phone you will probably find on the App menu or in the T-Mobile folder this new T-Mobile application for unlocking your device. This App will unlock your device in certain conditions ,you can check if your phone is eligible by checking the T-Mobile Device compatibility page or just by trying it and pressing the Permanent Unlock button from the Device unlock app. If you trying it and you get a message like “Unlock Failed: This mobile wireless device is not eligible for unlocking. For Device Unlock eligibility details, please go online or contact Customer Care.“ ,basically means the phone is not eligible for a free unlock from T-mobile.
    In this case you do not need to panic is still a way to get it done, you can get a T-mobile Device Unlock service from onlineunlocks.com and you will have your phone unlocked in a few days max.

    The problem comes when you press Permanent Unlock button from Device unlock app and you get an error. In this case before even ordering an unlock from us you will have to try and get passed over this error and get to the normal eligibility message “Unlock Failed: This mobile wireless device is not eligible for unlocking.”. One of the most commons error for the T-mobile Device Unlock App is “Device not recognized” and in this post will present a few easy methods about how you can fix it and be able afterwards to get your T-mobile android unlocked.

    Normally this is a problem caused by the fact that T-mobile server is not recognizing your device or there is a conectivity problem betweein your phone and the Tmobile server and the server was not able to receive the phone details ,and to know how to fix it first we need to identify the possible reasons.Below you will find the most common reasons and the solutions for each”:
    -One of the most common reasons might be the fact that the phone is not showing in the T-mobile database ,either is not a T-Mobile phone or was not activated with T-mobile SIM
    How cannot be T-mobile since it has the T-mobile software on it? If you are not the original owner of the phone and you know for certain that is T-mobile can be a phone from a different network that was flashed with the T-mobile firmware. Also if it was never activated with a T-mobile sim that might be the reason why was not showing in the T-mobile database. You can verify on the T-mobile website to see exactly if is showing on not in the tmobile database https://www.t-mobile.com/verifyIMEI.aspx
    If is not a T-mobile phone for sure you will not be able to unlock it with the Device unlock app,maybe instead can flash the original firmware and unlock it by code. If was never activated with a T-mobile Sim activating it with a new T-mobile sim might solve your issue.
    -The internet connection might be very slow, that is why the T-mobile recommends using a good wifi connection when performing the request
    The solution would be to change the connection to a faster and more stable connection, restart the phone and try again

    -There is a firewall on the phone or on the rooter of the wifi you are connected to that might stop the connection to server
    Verify if you have any antivirus program installed on your device and stop it for a bit, and if not check on your router if you have access or if not just use other internet connection

    -Might be a problem with the Device Unlock app
    To fix this first of all clear the application cache. From the Home screen, tap Settings > Apps. Select the Device Unlock app and if available select Clear Cache. Can also try and clear all cache by booting into recovery mode (turn off then hold home(or bixby) power and volume Up) then select “Wipe cache partition”

    -The phone might be reported lost or stolen and because of that is blacklisted by T-Mobile
    Can verify on the T-Mobile website the exact status and contact us afterwards if you do not understand the exact status or what can be done https://www.t-mobile.com/verifyIMEI.aspx .

    -Might be a problem with T-Mobile server
    Even if this is less possible, I know cases when has happened, so just wait for a few hours, do a restart and maybe even change the wifi connection and try again.

    -The phone might be rooted or have other not official changes made to it
    Try and make a firmware upgrade if is available : Settings menu → Software update and select “Download updates manually” to check for any updates.
    If not working can try to do a factory reset from System settings > Backup & reset. As a last resort can go ahead and restore full firmware either using the program Odin or Samsung Kies.This last part might be a more complex process so if you decide to do this look carefully into it or ask help from a professional, can contact us on the chat our website https://onlineunlocks.com/.

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    Last edited by onlineunlocks.; 07-23-2018 at 07:40 AM.

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