To call Barbados from San Marino, you first need to find out the Barbados country code. The country code for Barbados is 246.
Next, you need to find out the San Marino area code. The area code for San Marino is 378.
Finally, you need to dial the Barbados phone number, followed by the area code and the phone number. For example, to call the Barbados Embassy in San Marino, you would dial 378-246-1111.