How many folks do you think still run with flip phones?
Probably not many. My understanding is that even if you want one of those old non-smartphone flip-phones, most cell phone service provides actually don't even offer service for them anymore.
I was talking to a neighbor who is a bit older and he said he went into Verizon to try to get a very basic flip phone (not a smartphone). He told me that Verizon said they don't offer any phones like that anymore, can't provide service for them, and your only option is a smartphone (albeit a very, very cheap and crappy one).