Should I icloud unlock first or network unlock first?

So, I bought an iPhone 7 locally and turns out it is both an at&t device, he told me it was TMobile and it is also icloud unlocked. I've found different sites to do both unlocks, but my question is, which on should I get done first? I can't get pass the wifi screen in setup without a compatible sim, which is why I need the unlock. How does each unlock work?