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It depends. Does he use a 3rd party launcher? I do, and when I long-press on a home screen, one of its choices is wallpaper; selecting that presents me with a bunch of sources to choose from, including Photos (the Google app).My friend was sent a photo and downloaded it, but how can he use it as wallpaper? He has the LG X Charge.
Like I did?Also, how do I stop this underline thing?
Where do you mean? Browser? The OP said: "My friend was sent a photo and downloaded it"There should be an option to use as wallpaper on any image you download/take.
See if long-pressing on a home screen brings up 'wallpaper' as a choice. Assuming it does, and he selects it, it should bring up several choices; here's mine:He just uses whichever launcher the phone came with, and he has no idea where the picture went.