Unlocked att iphone on sprint/boost?

I need some help. My mother has an iphone 5s 16 gb white that she's willing to give to me only if i can unlock it. If she cancels her plan (she's not on contract) i can jailbreak it and unlock it. Then with the unlocked iphone would i be able to take it into boostmobile and connect it as my daily phone? I currently have a lg f7 and how would i go about removing that phone from my plan and connecting the iphone?

Unlocked ATT? Yes, shouldn't be a problem. Boost website ought to be able to tell you the conversion process for programming via a PC at home. Basically you'll have to move your SIM from LG over to 5s. Be advised to see if it's same size or if you need a micro/nano sim card adapter. Best luck.