WiFi Calling on 5.0.2?

I am currently on 5.0.2 with root. Is there a way to incorporate the new WiFi calling feature in this version? Also, I noticed that on 5.1.1 when connected to WiFi, 4G will grey out. Is this just a cosmetic change or is the phone actually turning off data while connected to WiFi? I would think this would help battery life if it is indeed turning off.

Thanks for any input.

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