at first know the Resolution pixels of ur cellphone Screen (for ex: 300X400) and transform ur wallpaper to its size and then u can keep it as wallpaper in ur cellphone
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Usb is a port, and is just a port for transferring data, the reason for different ports is data transfer speeds. Now if your talking usb flash drive or sd card, you just plug it in and go to my...
You simply tap and hold the picture you would like as your wallpaper and then crop that picture which is where you pick what you would like in your wallpaper. Then simply click "save" and you will...