I’ve gone through this same process just last week. Bought a new second 5G phone with dual SIM capability that had Android as the OS. Some apps aren’t available with iOS.
Purchased two prepaid SIM cards to trial coverages on 5G.
Using my ID is never a problem as this second phone is purely to have another number and email address that protects my personal ones from spamming and scams.
If you’re not doing anything shonky using your ID to sign up a second prepaid SIM shouldn’t be a problem.
The benefits of having a dual SIM phone is having one SIM that may be good value for call/text and the other SIM might have better value for data.
I now have the best of both worlds, my iOS phone for ease of my everyday private life then the Android phone that allows me freedom to do other activities that I want to exclude from my good phone. Like setting up a quarantine phone.
The Android phone because it will be run on prepaid cards, if I don’t wish to use it for a while, I can just shut it down then recharge the SIMs when wanting to use it again.