Nokia N8-00 - Can I use micro-SIM card in a Nokia device which has a standard SIM card slot?

No, micro-SIM card is not supported in phones with a standard SIM card clot. Do not use a micro-SIM or a micro-SIM with an adapter in these devices. This is a particular issue with sliding SIM reader.

Nokia devices with standard SIM card slot (e.g. N8-00, C7-00, E7-00, C6-01 and C6-00 etc.) are designed to be used only with a standard SIM card (known as 2FF SIM card or 2nd Form Factor or plug-in SIM). The use of incompatible SIM cards or adapters may damage the SIM card, the device, or both, and may also corrupt data stored on the SIM card.