Sony Ericsson R380 WORLD User Guide - Page 6

GSM 900/1900 Dual Band The Ericsson R380 is a dual band phone, which means that you can use your phone in two different kinds of networks - the GSM 900 and GSM 1900 systems. The GSM 1900 system is used primarily in the US and other parts of the Americas, and the GSM 900 system is used primarily in Europe, the Asia/Pacific region and in some parts of Africa. This means that you can used your R380 on six continents. Switching between the two systems is done automatically, which means that you can use your phone without ever having to consider which system is being used. This is taken care of by the networks. However, you should note that the functions offered and the network coverage differ depending on your choice of operator and/or subscription. SIM and PIN You will obtain a SIM (Subscriber Identity Module) card with your subscription. The SIM card contains a computer chip that keeps track of your phone number, the services you have ordered from your network operator and your Phone Book information, among other things. Your SIM card is supplied with a security code or PIN (Personal Identity Number), which you need in order to gain access to the network. Your PIN may also be required when you want to change settings in your phone. Furthermore, some operators may have services that require a second PIN, your PIN2. You will find your PIN (and PIN2) in the information from your operator. If you have set certain security options in your phone, when you turn on your phone, it prompts you to enter your PIN. If the PIN is entered incorrectly three times in a row, the SIM card will be blocked. If this happens you can unlock it by using your PUK (Personal Un-blocking Key code), which you also get from your operator. You should be careful with your PIN, since it is your protection against unauthorized use of your phone and subscription. 6 General Information