Function unlock 

pub unsafe extern "C" fn unlock(sim_id: Id, pin: *const u8) -> c_int

👎Deprecated since 0.2.0: Use ‘mcm::sim’ module instead.

Available on non-ag35 only.

Unlock the SIM card: it will disables the request of PIN code.

If PIN code is too long (max 8 digits), it is a fatal error, the function will not return.