1ST Method :: Band Lock (LTE Only)
>Dial *#*#4636#*#*
> Select phone information
> Select “Set preferred network type”
> Select LTE Only
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If this Not Work Try To Manually Set Brand To LTE
Install 4G LTE Switcher from Play store
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> For MediaTek processor
> Install MTK Engineering Mode
> Run app
> Select ‘MTK Settings’
> Select ‘BandMode’
> Select SIM slot where you have put your Jio SIM
> Select ‘LTE mode’
> Select band 40 for best speed or band 5 for best coverage
> Save settings & reboot mobile to activate changes.
2ND Method :: Change Your APN Setting
> Name – RJio
> APN – jionet
> APN Type – Default
> Proxy – No changes
> Port – No changes
> Username – No changes
> Password – No changes
> Server – www.google.com
> MMSC – No changes
> MMS proxy – No changes
> MMS port – No changes
> MCC – 405
> MNC – 857 or 863 or 874
> Authentication type – No changes
> APN Protocol – Ipv4/Ipv6
> Download Snap VPN from Play Store
After changing the APN settings, download Snap VPN app from the Google Play Store. Once you have installed the app connect to the server. This should improve your downloading speed but not browsing speed.