How To set best apn on JioFi device local admin panel?

I am using JioFi device to make a small wifi network on my small business community. Just developed the wifi network, the Jiofi device manufacturers can say that the network can be connect up to 15 devices. But many of the friends telling that, while setting up the correct access point in the login panel of the JioFi device at jiofi.local.html, we can make it the best speed in data and can connect some more device too. Now there is no any issue with JioCall on my device. That I adding here

Now using the default apn settings. If anyone know, please let me know the details, please.

Due to this, I cannot enjoy the music channels on Directv.