Android app ads are not being blocked with Pihole + Unbound

[deHakkelaar]

Well when I was reading your OP, Private DNS was most defenitley not mentioned.
And I'm not good with screenshots

Can you advertise the Pi-hole IP several times as a DNS server in the LAN DHCP service settings?
That solved it for below OnePlus:

Removing Google DNS after using pi hole DHCP

I went to advanced section of wifi menu on my android phone. There it states all details such as IP address, DNS and MAC address. Got the dns from there. Wifi is configured to use dhcp and not static. Is it possible that my phone (Oneplus 7t) uses hard coded dns servers? Is there a configuration where I can check if pi hole is using a secondary dns? My phone should not be on previous dhcp lease as I have disconnected and reconnected to wifi multiple times after making my pi hole as dhcp serve…

If Pi-hole is installed bare metal, you can validate with below one:

sudo pihole-FTL dhcp-discover

The upcoming version 6 release does that default OOTB when you activate Pi-hole's own DHCP service:

$ pihole-FTL --config dhcp.multiDNS
true

$ sudo pihole-FTL dhcp-discover
Scanning all your interfaces for DHCP servers
[..]
   dns-server: 10.0.0.5
   dns-server: 10.0.0.5
   dns-server: 10.0.0.5