This may look like a huge old cellphone from the 1980s, but it's actually just shaped like one. It's really a cellphone holder. Oh, uh, OK.
I'm not quite sure what the benefit is of carrying your phone around in a larger phone. I guess it's protected if you drop it, and it's a fun, ironic gag. But I don't know how many people would be willing to put up with the inconvenience of something that large just for a visual joke.