Cheap Disposable Cell Phones

For grandma/grandpa, very young children, or someone who wants a disposable phone.

Sell pre-charged on MVNOs.

Taiwanese chip maker MediaTek has made it simple and cheap to build a phone: "They'll give you the chip and the reference design, and you can put it together with a screwdriver."

Mind you, it isn't a highly desirable phone—Windsor used a word I can't print in this dignified magazine.