New Reliance Jio Works With 3G and 2G Smartphone

Firstly you need to install shortcut master lite app from Google PlayStore.
 After installing Open the app and click on menu option.
Now search for service menu or engineering mode.
Now Open engineering mode and select & Save LTE bands.

Jio Sim

It is know fact that many users in India have 3G smartphones at present. Very few
might have upgraded to 4G devices. Reliance JioJoin app in LYF mobiles powered JioFi devices will make any phone VoLTE ready as per the company's statement. USe Jio 4G SIM services in all second and third generation mobiles via JioFi device.

After that reboot/ restart your smartphone. Now insert your Jio SIM card. Now you can use Jio SIM to avail preview offer.

Jio Sim

It is a know fact that many users in India have 3G smartphones at present. Very few might have upgraded to 4G devices. Reliance JioJoin app in LYF mobiles powered JioFi device device will make any phone VoLTE ready as per the company's ststement. Use Jio 4G SIM services in all second and third generation mobiles via JioFi device.

If the process mentioned above fails, then try this step.

Jio Sim

Dial *#2263# > select menu > reply with 0000 Select UR Settings then go to protocol > NAS >
Network Control > Band Selection > LTE Band > The Select "Band 40".

Jio Speed Test Updated 
WATCH