Hi there! I see your Pixelfed app is showing a "no server connection" message on your iPhone with iOS 18.5. Let's get to the bottom of this so you can start enjoying the app again.

First, just to clarify—are you trying to connect to the default Pixelfed server (pixelfed.social), or are you using a custom Pixelfed server instance? This helps narrow down whether it's a server-side issue or something on your device or network.

Meanwhile, here’s a step-by-step checklist you can try on your iPhone:

1. Check your internet connection: Make sure your device is connected to Wi-Fi or cellular data and that other apps or websites are working properly.

2. Close and reopen the Pixelfed app: Sometimes the app just needs a fresh start.

3. Force quit the app: Swipe up from the bottom (or double-click the home button, depending on your iPhone model), then swipe away Pixelfed to force close it, then reopen it.

4. Switch network types: If you're on Wi-Fi, try switching to cellular data or vice versa, in case the network is blocking the connection.

5. Check if the server is down: Pixelfed’s main server pixelfed.social has been known to experience downtime. You can visit their Mastodon or Reddit community updates to see if there’s a known outage right now. There have been recent fixes and issues reported with server connections.

6. Re-enter your server URL in the app: If you're using a custom server, double-check that the server address is correct in the app settings.

7. Restart your iPhone: Sometimes a restart clears underlying network or app glitches.

If these basics don’t help, it'd be useful to confirm whether you get this error only on your iPhone or on other devices too. Also, are you able to access the Pixelfed server through a web browser on your iPhone or another device?

Let me know what you've tried already or what you observe, and we'll dig a little deeper! If it turns out to be a server-side issue, I can guide you on checking for updates or possible workarounds.