Network problem

[NazrulIslam01]

My Samsung a51 mobiles (Airtel sim) Network is not connect 4g autocratic,,, when I restart my phone then connect 4g but after sometime autocratic connect 3g,,, why,,please help 🥺🥺🥺🥺

First sim is Airtel and second sim is Banglalink,, 

and my area is in 4g coverage 

[AYush2313]

Ask you carrier it's not phone's issue

[squadkid42]

Please raise complaint on airtel thanks app help center

[HECKER_Sr]

Bro it's an network chipset issue. I also faced it whenever I try to connect both sim to dual 4G one primary sim is in 4G stable but the secondary sim card is shifting randomly to 4G-2G-3G and so on. Can't fix that and asked Samsung to fix this issue but they didn't😔

[praveenbishnoi29]

Install samsung band selection app from playstore
And select lte only option

[cs-member13]

Dear Samsung Member,

Greetings from Samsung Customer Support!

To resolve your device network issue please visit this link: https://www.samsung.com/in/support/mobile-devices/samsung-mobile-network-issues/#:~:text=1%20Check%2....

For further assistance, register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).

Thank you for writing to Samsung.

Warm Regards,
Samsung Customer Support