8This device supports WAP 2.0 protocols (HTTP and SSL) that run on TCP/IP protocols. Somefeatures of this device, such as web browsing, e-mail, push to talk, instant messaging, andmultimedia messaging, require network support for these technologies.■ Enhancements, batteries, and chargersCheck the model number of any charger before use with this device. This device is intendedfor use when supplied with power from the AC-3, AC-4, AC-5, DC-4 chargers or CA-44charger adapter.Warning: Use only batteries, chargers, and enhancements approved by Nokia foruse with this particular model. The use of any other types may invalidate anyapproval or warranty, and may be dangerous.For availability of approved enhancements, please check with your dealer. When youdisconnect the power cord of any enhancement, grasp and pull the plug, not the cord.General information■ Access codesLock codeThe lock code (5 digits) helps to protect your phone against unauthorized use. Thepreset code is 12345. Change the code, and keep the new code secret and in a safeplace separate from your phone. To change the code and to set the phone torequest the code, see “Security,” p. 74.If you enter an incorrect lock code five times in succession, the phone ignoresfurther entries of the code. Wait for 5 minutes, and enter the code again.When the device is locked, calls may be possible to the official emergency numberprogrammed into your device.PIN codesThe personal identification number (PIN) code and the universal personalidentification number (UPIN) code (4 to 8 digits) help to protect your SIM cardagainst unauthorized use. See “Security,” p. 74. The PIN code is usually suppliedwith the SIM card.The PIN2 code (4 to 8 digits) may be supplied with the SIM card and is required forsome functions.