Hi @Jdw137, and welcome to the Sonos Community!
Are you referring to AirPlay? If so, I’d recommend starting with a network refresh - you can do this by rebooting your router (turning it off for about 15 seconds before turning back on), followed by rebooting each Sonos device when the network comes back online.
It may also be worth rebooting the iPhone to be safe.
If you’re still unable to connect to your Sonos speakers using AirPlay, I’d recommend getting in touch with our Support Team via either live chat or phone call - they’ll have more tools available to perform some live troubleshooting :)