My phone is a Xiaomi Poco X3 pro, running Android 12 [QKQ1], and it says it has MIUI Global 13.0.4 stable. Firefox is version 118.1.1. With Firefox, I am able to access the internet through Wi-Fi, but not using mobile data. With Chrome, both work.

I have checked the permissions [Wi-Fi and mobile data are allowed], and even deleted and re-installed Firefox, and also reset the AP settings associated with my SIM card. Nothing helped.

I should say that in the past no such problems had occurred, but I do not know when exactly this problem started to occur.

Another observation is [and I am not sure whether that could be related] that some apps seem to sometimes lose network connectivity until I restart them. For example, I have a public transport app to search for connections and buy tickets, which sometimes hangs until I remove it from memory and restart it. This problem seems not to occur with other people using the same app at the same time and place [but on another phone].

Xiaomi phone with MIUI 12 weird issue when turning on mobile data it flashes the 4G logo on and off constantly and I don't get internet connection. I tried to reset the network, update the soft and delete and reset the APN, restart the phone. There is only 1 sim and the phone sees it and the Wi-Fi does work.

My las 2 options are: factory reset and RMA it. If you had this problem and found a fix to it I would like to know how you did it.

Edited May 11, 2021 by AlinG

• 1

I can connect with Turkish sim card but I can't connect with a Greece sim card. I tried to swich sim card slot but nothing changed. I can connect with both of them in turkey but none on them connects in Greece with a Greek sim card

Mi Note 3 cihazımdan Tapatalk kullanılarak gönderildi

• 2

  I can connect with Turkish sim card but I can't connect with a Greece sim card. I tried to swich sim card slot but nothing changed. I can connect with both of them in turkey but none on them connects in Greece with a Greek sim card

Mi Note 3 cihazımdan Tapatalk kullanılarak gönderildi

I recall in another post you wrote that you bought this phone in Greece, correct?

Did you buy it new, and unlocked the bootloader yourself?

If you bought it used, it might be blocked in Greek networks for some reason.

• 3

  I recall in another post you wrote that you bought this phone in Greece, correct?

Did you buy it new, and unlocked the bootloader yourself?

If you bought it used, it might be blocked in Greek networks for some reason.

I bought in Greece at first hand. I unlocked the phone. Now I tried with my dad's sim card [same company's sim] and it connected.

So what could be? Is problem caused by my aim card or my operator?

Mi Note 3 cihazımdan Tapatalk kullanılarak gönderildi

• 4

I think I would just ask for a replacement SIM, since it works on your Dad's with the same company.