Phone Unlocking Free t-mobile sim in new phone

[Explosivo]

hey
if i get one of these free t-mobile sim cards will it work on a phone that was t-mobile before, or will i still have to get it unlocked?

:Cheers:

 

[Dutcho]

Nope, if it was t-mobile before then another t-mobile sim will be fine

 

[Explosivo]

Thanx m8.