I am able to connect android phones to our private 5G network which has PLMN 999-99 and 001-01.
But iphone is not getting connected even after apn addition and supported plmn.
Please help if you know.
I think you should make profile for enabling SA. Check below link:
Also iPhone enable 5G SA/NSA and LTE bands based on surrounding PLMNs, make sure N78 is enabled for your country.