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Yes, Realme 1 supports VoLTE in both the SIM slot but there is one catch that you cannot use both the SIM on VoLTE at the same time ..If SIM 1 is on VoLTE then the other SIM will be on 3G network.
Check the complete specs here :- Realme 1
Yes, Realme 1 supports OTG. USB OTG or USB On-The-Go is one of the most recent technologies that allows you to connect your pen drives and in some cases hard disks to your smartphones and tablets. It has a cable and through that cable, you can directly view and use your pen drive in your smartphones.
You can check the specs here:
You can also check the complete specs here: Realme 1