Anyone using Jio in 3G phone?

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#1
Hello guys,
Sorry if this is in wrong section.
One of my friend using Jio 4G sim in 3G handset but he wouldn't told how he did?
I tried various guide and also watched and did as some videos showed on YouTube but all in vain.
After requesting my friend on how he did he just gave me a hint that device should be on Kitkat or above versions of Android.
Now if anyone of you are using 4G on a 3G handset than can you please share the steps?
Thank you.
 

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