Cool [Q] Aftr unlocking, SPRINT Galaxy S4 SPH-L720 wrking wth otr GSM BUT not CDMA carrier

I recently got a locked Sprint Galaxy s4 SPH-L720. I bought it to unlock it and then use it with a CDMA carrier in India.

following an you-tube video (used website too), I was able to unlock the phone.

After following the steps, I was able to unlock the phone for GSM.

But as soon as I put a CDMA sim card...It displays "Invalid Sim"

Can someone please suggest something to make it work for CDMA too. I changed the network settings from GSM to CDMA but that didn't help too.

Any suggestions are welcome!