Default need help.. do i need sprint activation

I recently bought sprint gs5 with bad ESN. hence I dont live in usa, o thought this shouldnt be a problem.

Ok I received the phone, I managed to activate it with our locale cdma network " no sim card used "

But I noticed some features not available such as usb tethering, hotspot wifi calling, raoming section.

I updated to NE5 but problem exists.
I finallu rooted and installed MOAR rom, usb tethering still not available. However wifi calling was there but frozen! After defrozen it, when I press on it takes me to self test mode!!

Hotspot didnt work either, I get msg saying " insert sim card"

Any great developer plz help me with those issues, also are they related to sprint activation?? Any solution to bypass.

Thanx alot in advance.

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