Charlotte Aitchison is a British singer, better known by her stage name Charli XCX, who recently used a Windows Phone. The singer gave her trusty Lumia device a workout by supplying fans with a mobile number so they could contact the pop singer after appearing on the Elvis Duran Show.
The above video shows why celebrities don't willingly hand out contact numbers to the vast amount of fans they accumulate on their road to fame. That said, it's an interesting experience to witness. Aitchison even began calling some fans back who contacted her, leading to some humorous results.
Source: YouTube; thanks, iAdrian23, for the tip!