Mail.
Actually, the basic concept of the fax machine is a lot older than most people think. The "electric printing telegraph" was patented in 1843 (that is not a typo; something very like a fax machine existed well over half a century before the telephone itself did).
Fax machines.
the phone
Telegrams.
Glass was used before film was invented.
Any email addresses used before the one you are using now.
I think it was invented to tell people stuff, like it's used for now.
candles
Brains.
Boats.
Before it was invented, it didn't exist. You can't use something that isn't there for anything.
Before it was invented, it didn't exist. You can't use something that isn't there for anything.
Before the telephone, telegraphs were used.
Sugar Lumps
fire
The human eye