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Can I use Jio 4G sim in 3G mobile?

To use a Reliance Jio 4G SIM in a 3G mobile phone, you need to follow some specific steps, as the phone itself does not support 4G natively. Here are the general methods and steps you can try:

Using MTK Engineering Mode App

This method is applicable for phones with MediaTek chipsets.

Download and install the MTK Engineering Mode app on your phone1 3.
Open the app or enter the mobile-specific code for Engineering Mode (e.g., *#*#4636#*#* for some devices).
Go to MTK Settings, select the “Preferred Network” option, and choose the network mode (e.g., 4G LTE, WCDMA, or GSM).
Save the changes and restart your phone.
Insert the Jio SIM in the first SIM slot and keep the second slot empty.

Using Shortcut Master App

This method is useful for phones with Qualcomm chipsets.

Download and install the Shortcut Master (Lite) app on your phone2 3.
Open the app and select “Engineering Mode” or “Service Menu” from the main menu.
If the option is not available, dial *#2263# from the dialer app, enter 0000 in the key input, and wait for a popup.
Select UE settings, then go to Protocol > NAS > Network Control > Band Selection > LTE Band and select Band 40.
Restart your phone and insert the Jio SIM in the first SIM slot.

Using Dialer Codes

For some devices, you can use specific dialer codes to access the engineering mode.

Dial *#*#4636#*#* to access the testing page.
Choose “Phone Information” and scroll down to find the “Set Preferred Network Type” option.
Select LTE/GSM auto (PRL) or any LTE option3.

Manual Network Selection

If the above methods do not work, you can try manually selecting the network.

Go to Settings > Mobile networks > Network carriers and choose the network manually.
After the manual search, select the Reliance Jio network signal in your area3.

Important Notes

These methods will only allow you to use the Jio SIM on a 3G network, not 4G, as the phone hardware does not support 4G.
Ensure your phone is running Android 4.4 KitKat or above for better compatibility.
Be cautious when making these changes, as they can potentially affect your phone's settings. Proceed at your own risk.

By following these steps, you can enable your 3G phone to use a Reliance Jio 4G SIM, although you will only receive 3G speeds.