What if error code 1000 persists after trying all the basic troubleshooting steps on my iPhone and Sonos system?

If the error persists, consider contacting Sonos support directly. They may have more advanced troubleshooting steps or be able to identify a specific issue with your setup. You can also try a factory reset of your Sonos speaker (as a last resort, as it will erase all settings). Before a factory reset, document your current setup for easier reconfiguration.