Default If I made the switch

So say if I Sim unlocked to T-Mobile would l be able to use their roms and not have to worry about updating bootloader to use kit kat. I'm new to Sprint all this changing this and that is too much, I miss just being able to flash everything in recovery.

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Actually been a fan/member of XDA since 2007
Old Phones-
T Mobile Sidekick 1&2, T Mobile MDA, T Mobile Wing,
T MobileTouch Pro 2, T Mobile Dash, Apple I Phone 1
(for two days, don't know what I was thinking lol)
T Mobile G1, T Mobile HD2, Google Nexus 1, T Mobile Galaxy3
Current: Sprint Not3
cc

XDA for life!!!