Which preposition will you end your sentence with?
Dang....I did it too....
This grammer is something up with which I will not put.
Any language which spells fone as phone, tells us to park in a driveway and drive in a parkway, etc. deserves to be mangled and in the grand scheme of things who cares what we place at the end of a sentence other than ?!.
The sole purpose of language is to convey our thoughts and with or without a post sentence preposition the thought is conveyed. Awkward sounding yes, but that is about it.