As electronic communication devices, retro telephones must meet strict regional standards. For the US market, FCC Part 68 and Part 15 compliance is mandatory to ensure the device doesn't harm the network. For the EU, CE marking, RoHS (Restriction of Hazardous Substances), and WEEE certifications are essential. If the telephone includes modern features like Bluetooth connectivity or a digital display, it must also pass REACH chemical safety standards and specific Radio Equipment Directive (RED) testing.