Nokia remains the world's number one manufacturer of mobile phones, although its position is under threat from other manufacturers, particularly Sony Ericsson and Samsung. Nokia have the advantage of outstanding loyalty from its traditional customers, together with a perceived reputation for reliability and user-friendliness. Nokia's buggy Nseries smartphones with their powerful but awkward Symbian operating systems have undermined some of this reputation in recent years. During 2007 however, Nokia have gadually improved their range. The latest Nseries phones have proven to be more reliable, and are certainly at the cutting edge in terms of features. At the same time, Nokia have improved the reliability and user-friendliness of their other phones, and have won back some friends with phones like the very popular 6300.