Unless RW has changed things in the last year or so, so that a non compatible device will not function at all when an active sim is installed…no signal, nothing…
Technically, if is a GSM SIM card, any GSM phone may see a tmobile signal and may “work” for calls and data, but will only do so with the underlying carrier number. Of course the RW app will not allow the user to activate the phone and nor will wifi calling, that is RW’s special Hybrid Coverage tech work., nor will a RW number work on that non-compatible phone.
Also, something to note @eddies.csrsel, using a incompatible device on RW is a violation of their Service Agreement and they may terminate your account.
But to put it simply, no, that phone will not work on Republic, not as you would intended it to as it is not supported.
I mention this as you seem clear that you still intend to “try”…and it may appear to “work”, but it actually is not.