Newly rooted phone from ATT looking to find home at Sprint.

After I was forced to discard my G S5 due to unfortunate screen vs. rock conflict, I decide to bring my S3 out of retirement as a temporary solution till I can swing the $700 for S7 in a couple of months.
However the S3 was/is an ATT phone and I'm now with Sprint. I just finished rooting the phone through Kingo root which appears to have been successfull. Having problem figuring out the next step.... I have my Spring sim card from S5 but the phone will not recognize the card, asking for a PIN..
Any advice for a newbie like me in this arena?
Thanks!

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