do they really disable them? I always thought that LTE modems only come with certain frequency bands. I can slightly remember that the iphone 5 only had 2 or 3

do they really disable them? I always thought that LTE modems only come with certain frequency bands. I can slightly remember that the iphone 5 only had 2 or 3 frequency bands while at the beginning of lte some providers did use the frequency which the iphone had more often, so some providers had better lte support. But I can hardly remember, it was some years ago and my provider switch basically came within the lte rollout. I mean it probably also consumes more energy to scan more bands (ok that could be solved with software)