S24 Ultra losing network connection

[Members_NfARtAs]

My S24 Ultra has been losing network connection regularly for the past two weeks. Before then, there were no issues.

What will happen is that I'll be on a call, and (usually) a few minutes into the call, I'll see that the call timer continues to run for several seconds, and then the call will end, network status will say "Searching", and the "no" symbol will appear where I usually see full bars of 5G.

If I restart the phone, I'll have connection again immediately.

Things I have tried to resolve this:

• Had my network carrier change my default phone tower to a closer one.
• Restarting the phone.
• Verifying that my eSIM is working properly and all settings are correct.

S24 Ultra

Product name: SM-S928U1

Model code: SM-S928ULBFXAG

[userjfEQgNRxOW]

This has been happening to my S22 Ultra. I get messages like " Not registered on a network" and Emergency calls only.' I went into my local store and they changed my SIM card where they did some troubleshooting but that did not solve the problem. I guess I will be going back to the store.

[DocHoliday1221]

Mine is same way I've been having issues with it 3 weeks now only connect to wifi I had new esim put in it works for fee minus and don't signal suck in places I never had a problem I have noticed my standalone 5 g button is now turned off and can't turn it back on I have a Samsung s23 ultra

[useraOriqsssKt]

Feel ur pain brother

[useraOriqsssKt]

Did anything work

[useraOriqsssKt]

Did anything u do get it to work

[Jules411]

From how you describe it (call continues for a few seconds, then drops, network goes into “Searching” until restart), this sounds more like a radio firmware / network handoff issue rather than a problem with your eSIM itself. Since it only started two weeks ago, something likely changed either in:

Software/firmware (Android or Samsung update)

Carrier-side configuration (tower updates, network mode changes, etc.)

Not sure how to assist you.

[Members_NfARtAs]

Thanks Jules411! Do you have any guidance about how I might find out which of those possibilities is true?

[Jules411]

1. Check for recent updates

Go to Settings > Software update > Download and install.

If available, install the latest update — Samsung often issues modem stability patches after reports like this.


2. Reset network settings

Go to Settings > General management > Reset > Reset network settings.

This will clear out eSIM settings, Wi-Fi, and Bluetooth pairings (you’ll need to reconnect), but it can resolve corruption from updates.

After reset, re-add your eSIM profile.


3. Change preferred network mode
Sometimes 5G handoff causes drops.

Go to Settings > Connections > Mobile networks > Network mode.

Test with LTE/4G only for a day and see if calls stay stable.

If it works fine on LTE but drops on 5G, the issue is likely carrier-side with their 5G tower or Samsung’s 5G modem firmware.



4. Test with Safe Mode
To rule out apps interfering:

Hold power button → long-press Power off → select Safe mode.

Make a few calls. If it doesn’t disconnect in Safe Mode, a third-party app may be interfering with your network services.


5. Try a different SIM/eSIM profile

If your carrier allows, temporarily load a physical SIM or a new eSIM profile.

If the issue persists even on a different SIM, it’s almost certainly firmware/hardware, not the SIM.


6. Carrier-specific troubleshooting

Ask your carrier to reset your line/provisioning. Sometimes the back-end profile needs a refresh.

See if they can confirm tower maintenance or upgrades in your area (since you said they changed your default tower, this could be related).


7. Last resort: Wipe cache / factory reset

Wipe cache partition (no data loss):

1. Power off → hold Volume Up + Power → release when Samsung logo shows.


2. Use volume keys to select Wipe cache partition → confirm.



If still failing, back up your data and do a factory reset. This rules out software corruption.

[Jules411]

If all of the above fail and it only recovers after restart, it could be:

A modem firmware bug (fixable only via Samsung/carrier updates).

A hardware issue with the modem or antenna.


In that case, since your S24 Ultra is still under warranty, contacting Samsung support or your carrier’s device support would be the next move.