You can already make a change on the shipment day. Where do I get my South African tracking number? Our PLATINUM Service is what you need. Pay the appropriate fees. USPS tracking number, you can opt in to track USPS package by phone. Mail forwarding and post management in general is no different. USPS to complete a change of address or place your mail on hold. With regular forward mail, your mail is forwarded to the other address piece by piece.