Unlocking an iPhone XR (Hypothetical?)

throwaway-ixr

    I plan to get an iPhone XR when it releases, but I noticed you can only get it on one of the big four members. The MVNO I *currently* use (Ultra Mobile) is on T-Mobile so I guessed I'd go with T-Mobile if they don't make a SIM-free version in time. So if they don't, could I get a step-by-step unlock guide so I can start using my phone service? (Even if I can use MVNOs pre-unlock, which I don't think I can, I would just prefer the options, y'know?)

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