How do you call a US 1-800 number from Latvia?

To call a US 1-800 number from Latvia, you need to use the international dialing format. First, dial Latvia's exit code, which is 00, followed by the US country code, 1. Then, dial the 800 number without the leading 1 (e.g., for 1-800-XXX-XXXX, you would dial 00-1-800-XXX-XXXX). Note that 1-800 numbers may not be reachable from outside the US, so consider checking if there's an alternative number available.