Follow the set of instructions given below to download the HP Smart App : Check whether your smartphone is sharing the same wireless network as your printer. Place your router and the smartphone closer. Now, open the Play Store and download the HP Smart App. Install the App now and open it to allow all the App permissions to proceed. Now, click on the plus symbol found on the App screen to add your printer. After connecting your 123.hp.com/setup printer with the HP Smart App, you can continue taking exclusive prints, copies, and scans at ease using the HP Smart App.