USE JIO SIM IN 3G PHONES

This trick work in some Mediatek based  phones only. Just try your luck

How to Use Reliance Jio 4G SIM in 3G Phones

• First, download and install the MTK Engineering Mode app on your phone from this link.
• This app will let you run an advanced Setup from the MTK phones' Engineering Mode Menu. This is also known as Service Mode.
• pen the installed app or enter the mobile specific code for Engineering Mode.
• Tap on the MTK Settings and Select Preferred Network Option.
• Then, you need to choose the network mode from 4G LTE, WCDMA or GSM. You can save it and restart your phone.

PLEASE NOTE:  We will not be responsible if anything goes wrong during the process. Users should proceed at their own risk.

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