Google play store does not let you download large-size apps without using a Wi-Fi connection, to change this you have to go through the settings and change the network preferences. Follow these steps: -Open the google play store app -Click on your profile icon (on the top right of the screen) -Then click on the Settings option -Then hit on the Network preferences button  -App download preferences will be visible, click on it -Then choose Over any network and click on done. -Now, you can download any app using your mobile data.