Sim800 sim card requirements
What kind of a sim card is required for sim800 module? 


The SIM interface complies with the GSM Phase 1 specification and the new GSM Phase 2+ specification for FAST 64 kbps SIM card. Both 1.8V and 3.0V SIM card 
are supported. The SIM interface is powered from an internal regulator in the module.

For more details see here and here. And remember "Google is your friend".

Cheers!