http://xmr4sm2krjiti3ds2nucvlb7keilve5nc2fwn3bhqjyo3s5frddtjrid.onion
Yes, use of Tor or VPNs are allowed and are recommended.
To use .onion for the CLI application, specify env variable MONERO_SMS_TOR=tor_socks_port Do you port numbers in or out? Numbers can be ported in for $1.49 or ported out for free.