When’s the last time you used a phone booth? As pay phones become less and less common the booths the housed them have been left behind in many cities. Not wanting to waste an opportunity to display art, the Somerville Arts Council and the Nave Gallery teamed up to recruit artists who transformed abandoned phone booths into public art. This Sunday, we’re celebrating the opening The Phone Art Box Project, from 2 p.m. to 4 p.m., with a tour of the first five completed phone art boxes. Follow Mayor Curtatone from box to box for mini-openings with refreshments at each box, or visit any box during the two-hour event at your leisure.