Most telegraph lines for electronic telegrams have either been taken down or just remain hanging on telegraph poles but have been disconnected.
However in some countries telegraph lines and telegraph services still exist today even with the advent of the internet and emails.
Around 20 million telegrams are sent through telegraphs each year in some countries but most countries do not use telegrams anymore through telegraphs.
There are some telegraph lines still on telegraph poles near the railroad tracks along a road I drive on often but those telegraph lines are no longer in use but they just never took them down.