ensured the 3210 huge commercial success. Much of the phone's success can also be attributed to an advertising campaign aimed predominantly at young people, a first in the mobile phone industry. The inclusion of 3 games, changeable "Xpress-on" covers (as on the previous Nokia 5110), an internal antenna, customisable ringtones and competitive prices led to the handset's huge popularity with those aged 15–25. With 160 million units sold, the 3210 is one of the most popular and successful phones in history. It is considered one of the most significant handsets Nokia ever developed. See also Nokia 3110 Nokia 3310 References 3210 Mobile phones introduced in 1999 Mobile phones with user-replaceable battery