I thought samsung welcomes rooting? It is only the carriers that force samsung to lock it.
If someone finds an exploit it is a win win for Samsung.
Must be because Samsung leaked OS's all the time. I dont know why carriers care. I think T-Mobiles is rootable.
----------
Samsung has Knox....which is built-in security if it is tripped voids warranty. not sure but pretty sure any exploits will void warranty.
I forgot about Knox. I didnt had knox on my GS3 and i havent bought a GS4 or 5. If you can root a Tmo GS5 without tripping Knox, i think id just delete it.