basic carrier change questions

KaptainRandom

Senior Member
Jul 22, 2011
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My family has been with sprint for decades.
We have never done a carrier switch.
Family plan.
All phones carrier unlocked.
We have 3 GS7s with sprint firmware.
Two are sprint hardware
One is U hardware

PHOENIX market.

Looking to change all 3 #s to tmobile family plan
Replacing the two sprint GS7s with GS20+
And keeping the GS7 U (sprint firmware)
But changing the GS7 U to tmobile.

Not worried at all about the new GS20s.

Concerned for what to expect of the kept GS7 U (sprint firmware).
Will tmobile flash new tmobile firmware to it?
Will tmobile turn on the proper tmobile radios?
Will the sprint specific bloatware remain and not be uninstallable?
Do I have to do the tmobile firmware/radios myself?

Thanx