What do you mean by the type of mobile phone? For example, 3G mobile phones, 4G mobile phones, navigation mobile phones, three-proof mobile phones, business mobile phones and so on?

3g: Powerful function is based on the extremely high data transmission speed of 3G mobile phones. At present, the transmission speed of GSM mobile communication network is 9. The CDMA 2000 star mobile phone Motorola XT800 is 6KB per second, and the data transmission speed that the third generation mobile phone may eventually reach will be as high as 2MB per second. What supports this point is that Internet technology is fully integrated into 3G mobile phone system, and the most important one is data encapsulation technology. At present, GPRS developed by using data packaging technology on the existing GSM can reach the transmission speed of 384kbps per second, which is equivalent to twice the transmission speed of D-ISDN. 3G mobile phones support high-quality voice, packet data, multimedia services and multi-user rate communication, which will greatly expand the connotation of mobile phone communication. 4g: 4G integrates 3G and WLAN, and can transmit high-quality video images. Its image transmission quality is comparable to that of HDTV. The 4G system can download at the speed of 100Mbps, which is 2000 times faster than the current dial-up Internet access, and the upload speed can also reach 20Mbps, which can meet the requirements of almost all users for wireless services. In terms of the price that users are most concerned about, 4G and fixed broadband networks are comparable in price, and the charging method is more flexible, so users can completely determine the required services according to their own needs. In addition, 4G can be deployed where DSL and cable TV modems can't cover, and then extended to the whole area. Obviously, 4G has incomparable advantages. 4G is just an idea put forward by people. It has more advanced functions, higher frequency band utilization and faster speed than 3G. Navigation mobile phone: Simply put, a GPS navigation mobile phone is a satellite navigation mobile phone. Different from the mobile phone electronic map, it can tell you where you are in the map and where you want to go, and choose the best route between your location and destination, and prompt you to turn left or right during the journey. This is called navigation. At present, there are two kinds of navigation mobile phones on the market. One is the real GPS navigation through satellite in space, with an error of 3-5 meters, such as T60 navigation mobile phone in Tianjiang. The other is rough navigation through base stations and networks, which is called A-GPS. This kind of navigation is not as accurate as satellite GPS navigation, and the general positioning error is 100 meter, such as Nokia 5233 mobile phone. Three-proof mobile phone: The definition of three-proof mobile phone is very simple, which is a mobile phone with slight dustproof, shockproof and waterproof functions, so it has always been loved by young users who love outdoor sports. With its professional waterproof, dustproof, excellent anti-falling and anti-rolling performance, it can be competent for extreme weather conditions and special occasions. One is that all major brands have launched ordinary three-proof mobile phones, but its three-proof function is only an auxiliary function, which can only be slightly three-proof. This kind of mobile phone is generally fashionable in appearance and has no obvious difference from ordinary mobile phones on the market. The second category is professional three-proof mobile phones, which are completely different from ordinary mobile phones in terms of modeling and three-proof coefficient. It can even withstand being soaked in water and crushed by cars for a certain period of time. Its target audience is professional outdoor adventure enthusiasts such as mountaineering and wading, and some people who like the military have a special liking for it because of its unique shape and strong physique. Business mobile phone: a branch series of mobile phone development, such as music mobile phone and smart phone, has more prominent business functions. First, it has dual standby or even multiple standby functions, and the standby time is long. Business people on business trips often need to use different mobile phones and different communication networks. Therefore, a mobile phone that can support different networks at the same time is the basic requirement of business mobile phones. Second, it has the function of invisible secrecy. Business people's mobile phones store a lot of precious data, and the value of data has far exceeded the value of mobile phones. Therefore, preventing the loss of mobile phones, data invisibility, confidentiality and other functions have become the standard elements of business mobile phones. Third, have basic office needs, such as surfing the internet, sending and receiving emails, etc. To meet the needs of business people.