DNS servers + changing

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Does anyone know where are the DNS server settings (cellular) and how to change/set them to servers of own preference? Thanks.

Update 15 Nov 2019

To check the DNS servers used you can use nmcli (using adb shell):

Get devices

nmcli d

Result on my phone:

DEVICE  TYPE      STATE        CONNECTION                
ril_0   gsm       connected    /204163554125122/context2 
wlan0   wifi      unavailable  --                        
sit0    iptunnel  unmanaged    --                        
lo      loopback  unmanaged    --

Get device info:

nmcli device show ril_0

Result on my phone:

GENERAL.DEVICE:                         ril_0
GENERAL.TYPE:                           gsm
GENERAL.HWADDR:                         (unknown)
GENERAL.MTU:                            0
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     /204163554125122/context2
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/1
IP4.ADDRESS[1]:                         178.227.211.124/24
IP4.GATEWAY:                            178.227.211.125
IP4.DNS[1]:                             84.241.227.81 <=== T-Mobile DNS server
IP4.DNS[2]:                             84.241.227.82 <=== T-Mobile DNS server