I'm in the US and I can probably get this phone locally as a used one and still 'locked' to Sprint network (I hope I can find one accepted as bring-your-own-device by RingPlus, which is a Sprint MVNO).
But I'm also looking for a phone which would support GSM so that I can stick in a GSM SIM and be on 2 different networks at the same time?
Do you think your instructions may work for me?