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Keep Losing Cellular Signal on Galaxy Z Flip 5? 13 Potential Solutions To Try

ByHarold Hisona Posted on Updated on

The Galaxy Z Flip 5 losing cellular signal is one of the more frustrating issues on this device — and it’s more common than Samsung would like to admit. The most frequent cause is a software or carrier settings glitch, but the Z Flip 5’s foldable design also means the antennas are positioned differently than in a traditional slab phone, making them more susceptible to interference from cases, hand placement, or even the fold itself.

This guide covers every fix from the quick 30-second resets to deeper diagnostic steps, ordered from most likely to solve it to most drastic. Most users resolve the issue by step 3 or 4.

Quick Overview: Why the Z Flip 5 Drops Signal

CauseHow CommonQuick Fix
Software glitch / stuck radioVery commonRestart + toggle Airplane mode
Wrong network mode (5G vs LTE)CommonSwitch to LTE/3G/2G auto in Settings
Corrupt network settingsCommonReset network settings
Physical case blocking antennaCommonRemove case and test
Carrier/SIM issueModerateRe-seat SIM, call carrier
Outdated softwareModerateInstall latest One UI update
Hardware antenna damageRareSamsung service center

Fix 1: Toggle Airplane Mode (30 Seconds)

This is the fastest fix and resolves signal drops in the majority of cases. Toggling Airplane mode forces the Z Flip 5 to completely disconnect from the cellular network and re-register with the nearest tower from scratch.

  1. Swipe down from the top of the screen to open the Notification Panel.
  2. Tap the Airplane Mode tile to enable it. Wait 15–20 seconds — don’t just tap it immediately off again.
  3. Tap Airplane Mode again to turn it off.
  4. Watch the signal bars. If they jump back to full bars within 10 seconds, this was the fix.

If the signal drops again within an hour, the problem is recurring and you’ll need to continue down this list.

Fix 2: Restart the Phone

A full restart clears the phone’s baseband processor — the chip that handles cellular communications — along with any apps or processes that may have locked up a radio connection.

  1. Press and hold the Power button + Volume Down simultaneously for 2–3 seconds.
  2. When the Power menu appears, tap Restart.
  3. After reboot, wait 60 seconds before checking signal strength.

Note: A simple restart is more thorough than toggling Airplane mode because it reinitializes the modem firmware, not just disconnects and reconnects.

Fix 3: Remove Your Phone Case

The Galaxy Z Flip 5 is a foldable phone, which means Samsung had to place its cellular antennas in positions that are more cramped than in a standard smartphone. The primary cellular antenna runs along the lower portion of the phone and through the hinge area.

Thick cases — especially those with metal components, magnetic wallet attachments, or pop sockets with metal bases — can directly attenuate the antenna signal. This is a documented issue with the Z Flip series.

  • Remove your case entirely and test in an open area.
  • If signal immediately improves, your case is the culprit.
  • If you need a case, use Samsung’s official Galaxy Z Flip5 cases or thin TPU cases without metal components.

Also avoid holding the phone in a way that your palm covers the bottom edge, as this is where the main antenna band is located on the Z Flip 5.

Fix 4: Change the Network Mode Setting

By default, the Z Flip 5 is set to automatically connect to the best available network — usually 5G. However, 5G coverage is still patchy in many areas as of 2026, and the phone can get stuck trying to connect to a 5G tower that’s too far away rather than falling back to LTE, which may have much better coverage in your location.

To manually set your network mode:

  1. Go to Settings → Connections → Mobile networks.
  2. Tap Network mode (may show as “SIM 1 network mode” on dual-SIM models).
  3. If you’re in an area with weak 5G coverage, select LTE/3G/2G (auto connect) instead of the default 5G option.

If you’re in a 5G area but still experiencing drops, try 5G/LTE/3G/2G (auto connect) to allow more flexible fallback behavior. In basements, rural areas, or buildings with dense concrete walls, switching to LTE-only mode often results in dramatically more stable connections.

Fix 5: Manually Select Your Carrier Network

When your phone is set to automatically select a network, it can sometimes latch onto a roaming network or a congested tower. Manually forcing it to reconnect to your home carrier can clear this.

  1. Go to Settings → Connections → Mobile networks → Network operators.
  2. Turn off Select automatically.
  3. Wait for the phone to scan for available networks (takes 30–60 seconds).
  4. Select your home carrier from the list.
  5. If signal is still unstable, re-enable Select automatically and let it reconnect normally.

This is especially useful if you’ve recently traveled and come back, or if you’ve crossed into a new coverage zone.

Fix 6: Reset APN Settings

The Access Point Name (APN) is your phone’s connection profile for mobile data. If these settings become corrupted or your carrier has updated their APN configuration, your phone can show full signal bars but have erratic connectivity or drop calls.

  1. Go to Settings → Connections → Mobile networks → Access Point Names.
  2. Tap the three-dot menu in the top right corner.
  3. Select Reset to default.
  4. Restart your phone.

If you’re on an MVNO carrier like Mint Mobile, Visible, or Google Fi, you’ll need to re-enter custom APN settings after resetting. Your carrier’s website has the exact values.

Fix 7: Re-seat the SIM Card

A slightly mis-seated SIM card is a surprisingly common cause of intermittent signal loss on the Z Flip 5. The fold-and-unfold motion of the phone can work a SIM card slightly loose over time, and even minor drops can shift the SIM tray enough to cause connection issues.

  1. Power off the phone completely before touching the SIM tray.
  2. Use the ejector tool (or a straightened paperclip) to open the SIM card tray on the bottom edge.
  3. Remove the SIM card and inspect for visible damage, corrosion on the gold contacts, or cracks.
  4. Gently wipe the gold contacts with a dry microfiber cloth.
  5. Re-seat the SIM card firmly and reinsert the tray until it clicks.
  6. Power the phone back on.

If your SIM card is more than 2–3 years old, ask your carrier for a free SIM replacement — worn contacts cause exactly this kind of intermittent signal issue and carriers replace SIMs at no charge.

Fix 8: Check for Software Updates

Samsung has released multiple One UI updates that included cellular connectivity fixes for the Z Flip 5. As of 2026, running the latest security patch and One UI version is essential for stable radio performance — there were documented bugs in earlier One UI 6.x builds affecting how the Z Flip 5 handled 5G handoffs between towers.

  1. Go to Settings → Software update.
  2. Tap Download and install.
  3. If an update is available, install it and allow the phone to restart.

Even if you’re already on the latest One UI version, double-check: go to Settings → About phone → Status information to verify carrier settings are current.

Fix 9: Test in Safe Mode

Safe Mode disables all third-party apps and runs the phone on Samsung’s stock software only. If your signal is stable in Safe Mode but drops when you return to normal mode, a third-party app is causing the problem — most commonly VPNs, network monitoring apps, or aggressive battery optimization apps that put the modem to sleep.

To boot into Safe Mode on the Z Flip 5:

  1. Press and hold the Power button until the power menu appears.
  2. Press and hold the Power off option on screen.
  3. When prompted, tap Safe Mode to confirm the reboot.
  4. The phone will show “Safe mode” in the bottom-left corner.

Test your signal in Safe Mode for 20–30 minutes. If signal is stable, uninstall recently installed apps one at a time — especially VPN apps, call-recording apps, or battery-saving tools — until you identify the culprit. To exit Safe Mode, simply restart the phone normally.

Fix 10: Reset Network Settings

This resets all network configurations — Wi-Fi passwords, Bluetooth pairings, cellular settings, VPN configurations, and APN profiles — back to factory defaults. It catches a wider range of configuration corruption than the APN reset alone.

Warning: You will lose all saved Wi-Fi passwords and will need to re-pair Bluetooth devices after this step.

  1. Go to Settings → General management → Reset.
  2. Tap Reset network settings.
  3. Tap Reset settings to confirm.
  4. Restart your phone and test signal.

Fix 11: Wipe Cache Partition (Recovery Mode)

The Z Flip 5’s system cache stores temporary data from apps and the OS. Corrupted cache data can cause stability issues including cellular radio problems. Wiping the cache partition clears this data without deleting any personal data, photos, or apps.

  1. Power off the phone completely.
  2. Press and hold Volume Up + Power button simultaneously.
  3. Release both when the Samsung logo appears and the Android Recovery screen loads.
  4. Use Volume Down to highlight Wipe cache partition.
  5. Press the Power button to select it and confirm when prompted.
  6. Select Reboot system now when complete.

Fix 12: Run the Samsung Members Hardware Diagnostic

The Samsung Members app includes a built-in signal and hardware diagnostic that can identify whether the issue is a software problem or a physical antenna fault. This generates a diagnostic log you can share with Samsung support and is important to run before pursuing a warranty claim.

  1. Open the Samsung Members app (install from Galaxy Store if not present).
  2. Tap Get help at the bottom.
  3. Tap Interactive checks.
  4. Select Phone signal or run the full diagnostic suite.
  5. Follow the on-screen prompts and save your results.

If the diagnostic flags a hardware issue with the antenna or modem, that’s your confirmation to escalate to Samsung service for a warranty repair.

Fix 13: Contact Your Carrier

Before assuming the problem is your phone, verify with your carrier that there are no known outages, tower maintenance, or coverage gaps in your area. Carriers can also push a remote SIM re-provisioning that can resolve signal issues caused by account-level configuration problems.

When you call, ask them to:

  • Confirm your SIM is provisioned correctly on their network
  • Check for any ongoing outages or tower work in your area
  • Perform a remote SIM refresh or re-provisioning push
  • Issue a free SIM replacement if your current SIM is more than 2 years old

When to Contact Samsung for a Repair

If you’ve worked through every step above and the Galaxy Z Flip 5 still drops signal, the problem is likely a hardware fault in the phone’s antenna system. The Z Flip 5 has more antenna complexity than standard phones due to the hinge mechanism, and physical damage from drops — even minor ones — can affect antenna performance without any visible external damage.

The Galaxy Z Flip 5 comes with a 1-year limited manufacturer’s warranty covering hardware defects. Signal loss caused by a manufacturing defect is covered; signal loss from physical damage is not. If you have Samsung Care+, accidental damage coverage may apply.

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