127TroubleshootingIf you have trouble with your device, try these procedures before youcontact a service professional.When you turn on your device, the following messages mayappear:Message Try this to solve the problem:The SIM card ismissing.Ensure that the SIM or USIM card is installedcorrectly.Enter PIN.When using the device for the first time or whenthe PIN requirement feature is enabled, you mustenter the PIN supplied with the SIM or USIM card.To disable the PIN requirement feature, tap Start >Settings > Personal tab > Phone > Security > SIM PIN,and then tap On next to Require PIN when phone isused.SIM cardblocked.Your SIM or USIM card is blocked, usually as aresult of entering your PIN incorrectly severaltimes. You must enter the PUK supplied by yourservice provider.
