I recently purchased a used, unlocked Samsung Galaxy S4 SGH-I337M (for the particular model see here). The phones native bands don't include the 1700/2100 AWS required by the cell phone provider (WIND mobile). However, the phone is able to get both talk and data as desired. The previous owner told me that he modified the phone to allow these bands.
I'd like to know
- Why was this possible? Is it because the phone has the bands but Samsung suppressed them or is the phone being hoodwinked into working without having both bands?
- Whether there is a chance a firmware update or factory reset will undo this feature?
Background: I'm a bit familiar with unlocking AWS bands using qcn files