Fonejacker

Kayvan Novak is a British television actor of Pakistani origin. He has appeared in medical drama Holby City, spy series Spooks, and most recently as an Iranian intelligence officer Academy Award-winning film Syriana alongside Matt Damon and George Clooney.In 2005 he and Ed Tracy created Fonejacker, a prank call-based show as part of Comedy Lab for Channel 4. After the pilot, he was given a Christmas special. The new series is on E4.

I haven't seen much about Fonejacker, the spoof phonecall series by Kayvan Novak which my son and I both love, but I came across a reference at Neatorama which prompted me to post this favourite clip from the first series: