How to Connect HP Printer to Mobile Phone at 123.hp.com/setup? First make sure the printer hardware is working Make sure the mobile device and the printer are used with the same WiFi network. Now download the HP ePrint App on your mobile at 123.hp.com/setup Then select the data usage preference on the mobile device and click “Done”. Now the “Home Screen” on your mobile will prompt a window. Here select “Allow” option for setup and also add your email account. Now follow the onscreen instructions to easily access the file you want to print. Now open the HP ePrint App to print any document or file. Press file Now go to the file folder and select the document to print. Finally, the process is complete. You can now connect the hp printer to the mobile phone through the 123 hp.com setup.