Android resolve my pihole via dns.mydomain.co.uk

The issue I am facing: resolve dns.mydomain.com on static ip using android so my mobile devices can resolve on mobile network on my pihole remotely.

Details about my system:
Believe for android I need a domain SRV record to point dns.mydomain.com, what I'm unsure of is if the pihole needs to be set to resolve dns.mydomain.com or will resolve all requests on port 53

What I have changed since installing Pi-hole:
DNS port 53 reachable to pihole from Internet checking port open externally. :thinking:

SRV record update 24-48hours
Thank you

***Update ***
looking at dns.adguard.com they have an A name record as they do resolving dns.mydomain.com on mxtoolbox.
dns.adguard.com are not using srv records.

I have duplication of above and still with dns.mydomain.com and port 53 open and forwarding to pihole-no joy on pfsense router.
Should this be dns over tls
:thinking::thinking:

Opening port 53 creates an open resolver, which will be quickly discovered and put to no good use.

Don't do this.