Hi, I'm just now coming out of the stone age and ditching my non smartphone (Pantech Renue) for what I believe to be one of the best smartphones out to date...the Samsung Galaxy Note 4. I have some serious questions before I make the switch from AT&T to Straight Talk with a Note 4. Here are my questions: 1) When purchasing a new Galaxy Note 4, could I purchase a Note 4 locked to AT&T and just purchase the byop activation kit from Straight Talk? Or do i NEED to buy an unlocked at&t/GSM Note 4 to work on Straight Talk network? 2) What are the best going websites for purchasing a New/Mint condition Note 4 at a reasonable rate (out of contract rate) ? 3) Any tips when making switch from AT&T to ST? How do you make sure mms works while on ST with Note 4? 4) What happens if I root the phone and freeze any apps I don't necessarily want to use? Does it mean the phone will have to be resold at a significantly lower price than a phone that hasn't been rooted? I appreciate any and all feedback! Thanks!