A telephone booth, telephone kiosk, telephone call box or telephone box is a small structure furnished with a payphone, a photo by infomatique on Flickr.
Although still fairly common, the number of phone boxes has declined sharply in Ireland since the late 1990s due to the boom of mobile phones. During my visit to Belfast I got the impression that the decline in Belfast has not been as great as what has occurred in Dublin.
Most telephone booths in Northern Ireland are able to accept two currencies. They are able to accept both pound sterling and euro, due to the proximity to the Republic of Ireland. Similarly, mainly in large cities in Great Britain, certain telephone booths accept both sterling and euro.