Default How to Root Cricket Samsung Galaxy 4

Hi I'm trying to root my cricket galaxy 4, I've heard there are apps that can root your phone for you, and have tried some but still am getting no root access after on root checker. Can someone please give me some advice on how to do this? Thank you

Sent from my SCH-R970C using XDA Premium 4 mobile app

phone: Tmobile Galaxy S3 SGH-T999
Rom: cm 10.2
firmware: 4.3.1
recovery: twrp
Build: Flashoholic

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Past S hd2...galaxy S2...Galaxy 3

Tablet: amazon Kindle fire hd
Rom: cm 11
Firmware: 4.4.2
Recovery: twrp