: You can download .xap files to a computer, move them to a memory card, and then select "Install local apps" from the three-dot menu in the phone's Store app (though this may fail if the app requires online validation). Popular Apps for Lumia 630

Use a PC tool like or CMD Injector to push the files to your device.

While many modern apps (like WhatsApp) no longer work on Windows Phone 8.1, you can still find legacy versions of useful software on sites like Mobyware :