MVNOs working on unlocked phones

Ok. I think i'm gonna get flak for this and I very well did try reading through every single thread related to this topic. I need a straightforward answer: do ALL MVNOs work on unlocked phones? I'm bringing my own handset (galaxy s7) and want to use an MVNO to save money. Some say certain MVNOs work only for au/docomo/sb branded phones (ex. UQ mobile only works on au phones... Am I right?). So will other MVNOs work for me? Maybe someone here has tried doing this. Please, please let me know your inputs! Thanks!

Each MVNO has a list of supported phones. If your phone is not on the list, there is no guarantee that they or we or anybody else can give you.

Not all MVNO tests smart phones on their network system which unable to do.

I need a straightforward answer: do ALL MVNOs work on unlocked phones?

No, the main consideration is the frequencies that the particular MVNO operates on. That has to match the frequencies that your phone operates on. As mentioned, each carrier tests their product with a select number of handsets. Phones not on the list that meet the specs will likely work, but will not be verified.

I'm bringing my own handset (galaxy s7) and want to use an MVNO to save money.

Most MVNOs that work on the docomo or softbank networks should work with your phone. Match the specs to be sure.

Thanks, guys! Very clear now. Thanks for the technical explanation, yllwsmrf. So I guess I'm gonna have to go through each of their websites and check what terminals have been tested on their network.