Fix Dropped Calls on iPhone for US Carriers (iOS 18)

Dropped calls on iPhones running iOS 18 can be caused by weak network signals, outdated carrier settings, or misconfigured network options. If you’re experiencing call drops with Verizon, AT&T, or T-Mobile in the U.S., follow these tested solutions to restore a stable connection.

1. Check Signal Strength and Coverage

Start by verifying your signal bar strength. If it’s low (1–2 bars), move to an open area or near a window. You can also check your carrier’s official coverage map online to confirm local tower status.

📘 For additional troubleshooting steps, visit the OnePlus iPhone Hub.

2. Reset Network Settings

Sometimes old or conflicting configurations cause instability. Go to Settings → General → Transfer or Reset iPhone → Reset → Reset Network Settings. Enter your passcode and confirm. Your Wi-Fi networks and cellular configurations will reset, but your data remains safe.

After the restart, reconnect to Wi-Fi and reinsert your SIM card.

3. Update Carrier Settings

Outdated carrier files can cause call drops or weak connections. To update manually: Settings → General → About. If an update prompt appears for “Carrier Settings,” tap Update.

Apple frequently collaborates with major U.S. carriers like Verizon, AT&T, and T-Mobile to push network optimizations via these updates.

4. Turn Off Wi-Fi Calling Temporarily

When Wi-Fi Calling conflicts with weak signals, it may interrupt voice calls. Disable it via: Settings → Cellular → Wi-Fi Calling → OFF. Try placing a call afterward to see if stability improves.

If your home Wi-Fi causes interference, reboot your router or switch to mobile data temporarily.

5. Toggle Airplane Mode and Reinsert SIM

Turn on Airplane Mode for 10 seconds, then turn it off. If the issue persists, eject the SIM card using a pin and reinsert it securely.

This forces your iPhone to reconnect to the nearest tower — often resolving intermittent drop issues.

6. Update iOS to the Latest Version

Apple releases carrier and modem stability patches with each iOS update. Go to Settings → General → Software Update and install any available update.

🔗 For system stability and performance optimization, explore Performance & System on OnePlus.

7. Contact Your Carrier for Tower Issues

If calls keep dropping in a specific area, contact your carrier’s customer support. They can verify if a nearby tower is under maintenance or if local congestion is affecting signal stability.

Verizon Support: verizon.com/support
AT&T Support: att.com/support
T-Mobile Support: t-mobile.com/support

🔗 Additional connection optimization guides are available at Connectivity & Network.

OnePlus Tip

If dropped calls happen only indoors, consider enabling Wi-Fi Calling again after troubleshooting or using a 4G/5G Signal Booster approved by your carrier. Consistent call drops across multiple locations may indicate a damaged SIM card — replacing it at a local carrier store often solves persistent issues.

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