Does Tmobile Note 2 have to be unlocked to change APN for Straight Talk?

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http://forums.androidcentral.com – Hi guys. I am a big technology dunce, so I am sure that this is a stupid question. I recently switched to Straight Talk and bought the Tmobile SIM for my Mytouch 4G slide, but the phone is unlocked because I needed to use it overseas. I now want to buy a Note II on ebay. If I buy a Tmobile Note II on ebay, will I be able to use the SIM that I have (I know I need to have it cut down, but I think they will do that at the Tmobile store) and still be able to add the new Straight Talk APN settings, or does the phone have to be completely unlocked to add a new APN? Thanks. (HowTos)