13 Easy Ways To Fix Slow Internet Connection on Galaxy Z Fold 5

Slow internet on the Galaxy Z Fold 5 is most commonly caused by one of three things: the Wi-Fi randomized MAC address setting (a known bug introduced in One UI 6 and still present in One UI 7), the phone latching onto a congested 5G mmWave band when a more stable sub-6GHz or LTE signal is available, or background data limits silently throttling your connection. Most users are fixed by Fix #1 or Fix #2 below — the rest are for cases where those don’t work.

The Galaxy Z Fold 5 launched with One UI 5.1.1 and has since received One UI 6, One UI 6.1, and One UI 7 (Android 15). Several of the fixes below address quirks introduced with those updates.

1. Fix the Randomized MAC Address (One UI 6+ Bug)

This is the #1 cause of sudden slow or intermittent Wi-Fi on the Z Fold 5 after software updates. Android’s randomized MAC address feature assigns a different hardware identifier each time you connect, which confuses some routers into throttling or deprioritizing the connection. This bug has been reported extensively on Samsung’s community forums since the One UI 6 rollout and persists into One UI 7.

1. Go to Settings → Connections → Wi-Fi
2. Tap the gear icon next to your home network
3. Scroll down and tap View more
4. Tap MAC address type
5. Switch from Randomized MAC to Phone MAC
6. Tap Forget, then reconnect to the network

Repeat this for every saved network where you notice slow speeds. If your router uses MAC address filtering, you’ll also need to add your phone’s actual MAC address to the router’s allowed list.

2. Disable Wi-Fi Power Saving Mode via Developer Options

A hidden Developer Options setting throttles the Wi-Fi antenna to save battery. It can get toggled on silently during software updates.

1. Go to Settings → About phone → Software information
2. Tap Build number 7 times until you see “Developer mode has been enabled”
3. Go back to Settings → Developer options
4. Scroll to the Networking section
5. Disable Wi-Fi scanning throttling
6. Disable Mobile data always active (this forces the radio to stay active even on Wi-Fi, which can cause conflicts)

3. Force the Phone to Use a Single Wi-Fi Band

The Z Fold 5 supports Wi-Fi 6E, meaning it can connect to 2.4GHz, 5GHz, and 6GHz networks. If your router broadcasts all three under the same SSID (called band steering), the phone constantly switches bands, causing speed drops and brief connection gaps.

Log into your router’s admin panel (typically at 192.168.1.1 or 192.168.0.1) and create a dedicated 5GHz SSID — name it something like “HomeNet_5G” — and connect your Fold 5 exclusively to that. If your router is more than two rooms away, 5GHz will outperform 6GHz because 6GHz has excellent speed but poor wall penetration.

4. Toggle Airplane Mode

A quick connection reset clears temporary network glitches caused by stale radio states.

1. Swipe down from the top of the screen to open Quick Settings
2. Tap Airplane mode to enable it
3. Wait 15–20 seconds
4. Tap Airplane mode again to disable it
5. Let the phone reconnect to Wi-Fi and cellular, then retest

5. Switch Away From 5G if Coverage Is Weak

5G mmWave (the ultra-fast variety) has very limited range and is blocked by walls, glass, and foliage. If you’re indoors showing a 5G icon, the phone may actually deliver worse speeds than LTE because the mmWave signal is too weak to sustain throughput. Sub-6GHz 5G is better indoors but can still be slower than solid LTE in fringe coverage areas.

1. Go to Settings → Connections → Mobile networks
2. Tap Network mode (or Network mode SIM 1 for dual-SIM)
3. Select LTE/3G/2G (auto connect)

If speeds improve significantly, your local 5G signal is too weak. Switch back to 5G auto when you’re in a confirmed strong 5G coverage zone.

6. Turn Off Data Saver

Data Saver throttles background data and, in aggressive configurations, can also slow foreground app speeds.

1. Go to Settings → Connections → Data usage
2. Tap Data saver and toggle it off
3. While here, tap Billing cycle and data warning and ensure no Data limit is active — the phone will throttle once the limit is reached

7. Reset the APN Settings

The Access Point Name (APN) controls how your phone connects to your carrier’s data network. Corrupted or outdated APN records after a carrier update can silently cap data speeds or route traffic through a misconfigured gateway.

1. Go to Settings → Connections → Mobile networks
2. Tap Access Point Names
3. Tap the three-dot menu (⋮) in the top right
4. Select Reset to default and confirm
5. Restart the phone

If your carrier uses a non-standard APN (common with MVNOs like Mint Mobile, Visible, or Cricket), you may need to manually re-enter the APN settings after the reset. Search for “[your carrier name] APN settings Android” for the exact values.

8. Check Your Actual Signal Strength

The signal bars on Android are notoriously misleading. For an accurate reading, use Samsung’s built-in Service Mode:

1. Open the Phone app and dial *#0011#
2. The Service Mode screen opens
3. Look at the RSRP (Reference Signal Received Power) value

RSRP Value	Signal Quality
-80 dBm or better	Excellent
-80 to -90 dBm	Good
-90 to -100 dBm	Fair
-100 to -110 dBm	Poor
Below -110 dBm	Very poor — coverage issue, not a phone issue

If your RSRP is below -100 dBm, the fix is coverage, not settings. Moving closer to a window, going to a higher floor, or contacting your carrier about a network extender will be more effective than any software tweak.

9. Select the Correct SIM for Data (Dual-SIM Models)

The Galaxy Z Fold 5 supports dual-SIM. If two SIMs are inserted, the phone may route data through the slower one — especially after inserting a new SIM or after a software update.

1. Go to Settings → Connections → SIM manager
2. Tap Mobile data
3. Select your primary data SIM explicitly
4. Toggle off Allow SIM switch unless you need automatic switching

10. Force Restart the Phone

A force restart flushes RAM and resets all running system processes, including the modem firmware. This fixes connectivity issues caused by software hangs that a normal restart can miss.

1. Press and hold the Volume Down button and the Power/Side key simultaneously
2. Once the device vibrates once, immediately press and hold the Volume Up key while still holding the Power key
3. Release both keys when the Samsung logo appears

11. Boot Into Safe Mode to Identify App Conflicts

Third-party VPN apps, network optimization tools, and some security apps are known to intercept and throttle connections on Samsung devices. Safe Mode disables all third-party apps temporarily without erasing data.

1. Press and hold the Power button
2. Touch and hold Power off on the screen
3. Tap Safe mode when prompted
4. The phone restarts with only system apps running — you’ll see “Safe mode” in the bottom-left corner

Run a speed test in Safe Mode. If speeds are significantly faster, a third-party app is the culprit. Reboot normally and uninstall recently installed apps one by one until the offending app is identified.

12. Check for Software Updates

Samsung has pushed multiple connectivity patches for the Z Fold 5 since launch, including fixes for Wi-Fi 6E instability and 5G band-switching bugs. Running outdated software means missing those patches.

1. Go to Settings → Software update
2. Tap Download and install
3. Install any available update and reboot

As of 2026, the Z Fold 5 is eligible for One UI 7 (Android 15). If you’re still on One UI 6 or earlier, updating is one of the highest-impact changes you can make for Wi-Fi and 5G stability.

13. Reset Network Settings

This wipes all saved Wi-Fi passwords, Bluetooth pairings, VPN configurations, and cellular settings back to factory defaults. It’s a broad reset — use it after the steps above have failed.

1. Go to Settings → General management → Reset
2. Tap Reset network settings
3. Tap Reset settings and confirm
4. Re-enter your Wi-Fi passwords after the reset

After reconnecting to Wi-Fi, immediately change the MAC address type to Phone MAC as described in Fix #1 to prevent the One UI randomized MAC bug from recurring.

When Nothing Works: Carrier and Hardware Checks

If all 13 steps haven’t resolved the issue, the problem is likely outside the phone’s software:

• Carrier throttling: Most unlimited plans throttle speeds after a data threshold (typically 25–50GB/month). Log into your carrier’s app or call support to check whether your line is currently throttled.
• SIM card failure: Old or physically damaged SIM cards cause intermittent data issues. Ask your carrier for a free SIM replacement — it takes about 5 minutes in-store.
• Antenna damage: The Z Fold 5’s folding hinge places repeated stress on internal antennas over time. If the hinge feels loose or you’ve dropped the phone, a Samsung authorized repair center can diagnose antenna damage. Contact Samsung repair at 1-800-726-7864 or visit samsung.com/us/support.
• Factory reset: As a last resort, a factory reset (Settings → General management → Reset → Factory data reset) eliminates any software-level cause. Back up your data to Samsung Cloud or Google before proceeding.

Quick Reference: Match Your Symptom to the Fix

Symptom	Most Likely Fix
Fast on cellular, slow on Wi-Fi	Fix randomized MAC address (Fix #1)
Intermittent Wi-Fi drops after One UI update	MAC address + Developer options (Fixes #1, #2)
Wi-Fi connected but “no internet” message	Single-band SSID or MAC fix (Fixes #1, #3)
5G icon showing but speeds are slow	Switch to LTE (Fix #5)
Sudden slowdown at end of billing cycle	Carrier throttling — call your carrier
Slow on both Wi-Fi and cellular	Safe mode test (Fix #11), then network reset (Fix #13)
Low signal bars everywhere	Check RSRP in Service Mode (Fix #8)