moon_sun_sky , via OnePlus 9 , Nov 10, 2021 : Hi all I bought the oneplus 9 256gb brand new. There is a big trouble with signalling. Sometime no service, internet is dropping as well sometime internet totally disconnected. This is really disappointing, I put my SIM card back to the old phone. I restart the phone ,update the mobile software , reset the network setting, I even call my service provider and got the professional advice. I done everything that I could do but problem still exist. Please let me know if I'm the only one or all of other user having same trouble? Thank you in advance Moon
Caomhin , via OnePlus 9 Pro , Nov 10, 2021 : You don't mention what exactly was tried. However you could give these steps a go, if you haven't already. Reset your Network adapters. Settings, System, Reset Options, Reset WiFi Mobile Bluetooth. Restart the phone. Check if this can help. Also check the website below for additional possible solutions. https://www.cnet.com/tech/mobile/ev...low-data-connection-and-poor-signal-strength/
Xcommunicad0 , via OnePlus 8T , Nov 11, 2021 : By any chance have you selected this SIM for Mobile Data and then switching off the Mobile data?
moon_sun_sky , via OnePlus 9 , Nov 27, 2021 : Thank you for your response 😊. To be honest I done everything. I have already followed the steps that you have mentioned. I am just worried that it might be that compatibility issue? I am using three UK network and I am using one plus 9 LE2110 Chinese version with the Google . !!! Before that I was using oneplus 7. I never had an issue with that phone I still don't know what to do. Network disappearing completely... Even the battery draining very quickly. For instance before sleeping if it's 20% in the morning phone would be dead without using even I switched off data wi-fi and Bluetooth everything I even close the apps...
Caomhin , via OnePlus 9 Pro , Nov 27, 2021 : It is possible that your Network is causing the drain issue looking for signal, that is a common issue on all phones. Also as its a Chinese model the bands for 4G, even 5G would be different than for an EU model. As you can see in the image below for EU and CN. Whether this may have a bearing I'm not sure. You would have to check what bands Three UK use to see if there is an incompatibility somewhere. https://www.google.com/amp/s/m.gsmarena.com/oneplus_9-ampp-10747.php And if you are running OOS, it will have been converted from ColorOS, as that's the OS used in China. As well as this, OnePlus won't support converted phones as they have a different Base OS for different regions. In your case ColorOS base with OOS on top. One or all of the items I mention could cause your issues, as the phone is designed for a different market, particularly the Network bands. You may have to contact the person you bought the phone from to see if the can do anything for you.
moon_sun_sky , via OnePlus 9 , Nov 27, 2021 : Thank you ❤️ for the quickest response 😊. Get me and suppliers email and the network pic as well. Suppliers email might help us to understand the problem. Dear Customer, May you please try to do the Factory Reset to see if it works better: https://www.devicesfaq.com/en/reset/oneplus-9-pro This phone supports the following network bands, may you please check it: Thank you
Caomhin , via OnePlus 9 Pro , Nov 27, 2021 : You would need to check with Three UK to ensure they support your 4G, 5G bands Also I am a user the same as you, so there wouldn't be anything I can do. As you have a converted China regional phone, you would need to contact OnePlus China for support, as that is the region your phone was intended for
