New Trick to Activate Jio 4G Unlimited Preview Offer [7/8/2016] Follow this thread by NiTiN and get a Jio sim (If you have managed to obtain a Jio sim then skip 1st step). Uninstall all Jio apps from your phone. Download old My Jio apk and Install it. Open My Jio and Click on Install all apps(download from Jio data). After installation open all apps one by one(except My Jio) Now turn OFF Jio Data(Important step). Open My Jio app click on sign in enter your id and password now turn on data and click on signin. In few moments, a popup will appear asking you to press Submit to activate Jio preview offer. Now your 2GB offer will get converted to 90 days unlimited preview offer. If popup is not appearing clear data of my jio app and repeat steps from 5-10.