Queries the SIM card with a PIN number to see if it is valid.
PIN : String with the PIN number to check
int : Returns 0 if the PIN is valid, returns -1 if it is not.
The text of the 86Duino reference is a modification of the Arduino reference, and is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.