Hi whether you want to use your t-mobile sim in either Motorola v3 razr or blackberry ...However sure you can use your sim in both phones only if they are unlocked one .Else if they are locked to some other network provider then you can't use it with t-mobile sim until you unlock it .You can easily unlock your phone using sites like TheUnlockArena.com they are providing unlock code for all mobile models at reliable cost .