173Solving Problems172The phone starts beeping and“**Warning** Low Battery” flashes onthe display• Your battery is insufficiently charged. Rechargethe battery.The audio quality of the call is poor• Check the signal strength indicator on thedisplay ( ); the number of bars indicatesthe signal strength from strong ( ) to weak( ).• Try moving the phone slightly or moving closerto a window if you are in a building.No number is dialled when you recall aPhone Book entry• Check that the number has been storedcorrectly, by using the Phone Book Searchfeature.• Re-store the number, if necessary.If the above guidelines do not help you tosolve the problem, take note of:• the model and serial numbers of your phone• your warranty details• a clear description of the problemThen contact your local dealer or Samsungafter-sales service.Access CodesThere are several access codes that are used byyour phone and its SIM card. These codes helpyou protect the phone against unauthorised use.When requested for any of the codes explainedbelow, enter the appropriate code (displayed asasterisks) and press the OK soft key. If youmake a mistake, press the C key one or moretimes until the incorrect digit is cleared and thencontinue entering the correct code.The access codes, except for the PUK and PUK2codes can be changed using the Security menu(Menu 6.6). See page 128 for further details.Important! Avoid using access codesresembling emergency numbers,such as 112, so that you do notaccidentally dial an emergencynumber.Phone PasswordThe Phone Lock feature uses the phonepassword to protect your phone againstunauthorised use. The phone password issupplied with the phone and is preset to“00000000” at the factory.To Seeactivate/deactivate the page 129.Phone Lock feature (Menu 6.6.3).change the phone page 130.password (Menu 6.6.4).