Are all Sprint phones unlock able???

[TW Granger]

I have a note 3 and a galaxy s4 that I need to get unlocked and I am not tech savvy enough or maybe just not brave enough to try an attempt it myself but I've had someone try which was paid and he said it was not possible.. So I am afraid to just pick a you tube video and go for it, I can at lease salvage some money from bad esn's... Lol.. But I do not understand about rooting either??? The services have already been terminated so idk if that matters or not?.?.? Please someone help me....i really need these phoned unlocked to be able to use a prepay carrier such as straight talk...........