Translation ? for telephone speech in Spanish?

Question

How would you say "the late 1800s?"

I am doing a speech for Spanish on the history of the telephone.

Answer 1

a terminos de 1800

Answer 2

"a finales de 1800" or maybe taht could be better "a finales del siglo XIX" (19th century, from 1800 to 1899)

Answer 3

el teléfono fue inventado por Alexander Graham Bell.