iPhone Wi-Fi Drops on T-Mobile After iOS 18 Update? Step-by-Step Fix

If your iPhone keeps losing Wi-Fi when connected to T-Mobile after updating to iOS 18, it can be frustrating. Wi-Fi drops are often caused by network settings, carrier changes, or software bugs introduced by an update. Follow these step-by-step fixes to restore a stable connection.

Step 1: Toggle Wi-Fi and Airplane Mode

Open Control Center or go to Settings > Wi-Fi. Turn Wi-Fi off, wait 10 seconds, then turn it back on. If that doesn’t help, enable Airplane Mode for 10 seconds and then disable it — this resets radios and often resolves transient connection issues.

Step 2: Forget and Rejoin the Network

Go to Settings > Wi-Fi, tap the i next to the problematic network and choose Forget This Network. Then reconnect by entering the password again. This clears any corrupted network profile that might cause drops.

Step 3: Reset Network Settings

If forgetting the network doesn’t fix it, go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings. This will remove saved Wi-Fi networks, Bluetooth pairings, and cellular settings — often fixing carrier-related Wi-Fi handoff or roaming problems.

Step 4: Check for Carrier Settings & iOS Updates

Go to Settings > General > About to see if a carrier settings update prompt appears; install it if available. Also check Settings > General > Software Update and install the latest iOS 18 build — Apple and carriers frequently release patches that resolve connectivity bugs.

Step 5: Disable Wi-Fi Assist and Background App Activity

Turn off Wi-Fi Assist in Settings > Cellular (it can switch to cellular data when Wi-Fi looks weak). Also reduce background activity for apps that may aggressively use networking: Settings > General > Background App Refresh → Off or Wi-Fi only. These steps help stabilize Wi-Fi usage on busy networks.

Step 6: Contact T-Mobile and Test on a Different Network

If issues persist, contact T-Mobile support to check for network-side problems or provisioning issues. Also test your iPhone on another known-good Wi-Fi network (friend’s home or public hotspot) to determine whether the problem is specific to your router or T-Mobile interaction.

For deeper connectivity troubleshooting, visit our Connectivity & Network guide. For tips on stabilizing system performance after updates, see Performance & System Optimization.

For a full collection of iPhone guides and troubleshooting, check the iPhone Hub.

OnePlus Tip

After major iOS updates, keep the phone connected to Wi-Fi and a charger overnight so system tasks complete. If Wi-Fi drops continue, try testing with a different router and note exact conditions (location, app in use, time) to help carrier or Apple support diagnose the issue.

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