I do not know about the US, but when it comes to Eastern Europe, people make business on WAP services. One of the best WAP email and cellular phone sync applications I ever seen are on http://beep.ru . WAP chats are very popular in Latvia at wap.one.lv. There is another mobile fun available. You can check your IQ through mobile phone and help of http://www.inpoc.lv. For a small aount of money.