[ 15 ]About your phoneRUIM card slotYour phone has an RUIM card slot built into its mechanics. However, theRUIM card slot is not functional in this phone model. Please avoid placinganything in this slot.Important battery information• Recharge your battery only with a charger approved by Nokia.• You can switch the phone on and use it for calls while the batteryis charging.• If the battery is totally empty, it may take a few minutes for thebattery indicator to appear on the screen.• If you switch the phone on when charging is complete, the messageBattery full is displayed momentarily.• Charging time depends on the charger and battery used. Please see“Battery information” on page 131, for more information.• If the battery has become completely empty, you may need torecharge it for a few minutes before you can make or receive calls.Prolong battery lifeA battery lasts longer and performs better if you fully discharge it fromtime to time. To discharge your battery, leave your phone switched onuntil the battery drains completely. Ignore any messages to recharge yourbattery and let the battery completely discharge.Important: Do not attempt to discharge the battery by any meansother than those just described.• SWITCH YOUR PHONE ONTo switch your phone on or off, press and holdthe power key (located on the top of thephone) for two seconds.Warning: Do not switch on the phonewhen wireless phone use is prohibitedor when it may cause interference or danger.Power key
