What did people use to communicate in olden days?

It depends on what you mean by 'olden days' - ancient peoples had to have most messages hand-delivered, often over hundreds of miles. In some cultures, carrier pigeons would be used to send and receive letters. In this county, native Americans might use smoke signals in a way similar to Morse Code; later there was the Pony Express, then the teletype (telegram); and finally modern phones and digital communication - just like this!