Network updating problem

[jh-sujon]

I bought s21 ultra vietnam varient 12/128

After purchasing phone I saw a problem like *Resitering device with network*

And automatic network has been activated I can't change mannual network mode I am from Bangladesh please help me 

[cs_member10]

Dear Samsung Member,

Greetings from Samsung Customer Support!

As per your query, Kindly contact the respective country helpline they will provide you with the exact information regarding this.

To reach country-specific Samsung support teams click on the below link:
https://www.samsung.com/country/

Warm Regards,
Samsung Customer Support