With sales of 250 million, the Nokia 1100 is the world's most popular mobile handset

"One summer in 2005, a man in Nigeria wanted in. He found a shop, put his money down on the counter, and left with a cellphone: a Nokia 1100, nearly identical to the model discontinued by AT&T that same year. Statistically, this was likely his first handset. He'd probably used a similar one through family or friends. Personal milestone or not, the tiny Clarkian miracle of that day represented a cold milestone for Nokia. It was their billionth phone sold.
In buying that phone, this man was joining a slightly smaller club. He became a Nokia 1100 user. Along with a staggering 250,000,000 others, he had traded up in the communications world, from little or no phone access at all to this little brick of a phone."
Source:  Gizmodo, 19th October 2010