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Redmi 4 will support volte.I give you a suggestion use Jio sim for more offer and speed.In my Jio is ...
Airtel also giving video call. And now a days Jio speed decreased. Idea and Airtel giving better performance than jio. So, it is better to use stble network. Im getting 6-9 mbps speed from Airtel, where im getting 150 kbps speed by Jio.