Getting a "Call Failed" or "Call Ended" message on your Samsung Galaxy S25 FE can stop you in your tracks. This usually means your phone is having trouble connecting to your carrier's network, which can be due to a weak signal, a software hiccup, or a simple setting that's out of place.
Let's start with the quickest fix you can try right now, which often solves the problem in seconds.
Toggle Airplane Mode On and Off
This is the fastest way to refresh your phone's connection to the cellular network. Swipe down twice from the top of your screen to open the full Quick Settings panel. Tap the Airplane Mode icon to turn it on, wait about 10 seconds, then tap it again to turn it off.
You should see the signal bars disappear and then reappear. This clears any temporary glitches that might be preventing your calls from going through.
Check Your Signal Strength
Look at the top-right corner of your screen. If you only see one bar or an "X" over the signal icon, you're likely in a weak coverage area. Move closer to a window or step outside.
If you're indoors, structures like concrete walls can block the signal. I've found that simply walking to a different room can sometimes make all the difference for call quality on the S25 FE.
Perform a Force Restart
A soft reset can clear out minor software bugs affecting the phone app or network services. Press and hold the Volume Down button and the Side key (power button) at the same time.
Keep holding them for about 10 seconds until you see the Samsung logo appear on the screen, then let go. Your phone will restart. This is different from a normal power off and on, and it's a good first troubleshooting step.
Check for Do Not Disturb or Focus Modes
Your S25 FE's Do Not Disturb or a custom Focus mode might be silently blocking calls. Swipe down from the top to check your Quick Settings. If you see a moon icon or a specific Focus icon like "Work" is highlighted, tap it to turn it off.
You can also go into Settings > Sounds and vibration > Do Not Disturb to make sure it's fully disabled and that no exceptions are blocking your contacts.
Verify Your Date and Time Settings
Incorrect time settings can surprisingly cause issues with network authentication. Open Settings > General management > Date and time. Make sure the "Automatic date and time" switch is turned on.
This allows your phone to get the correct time from the network, which helps maintain a stable connection for calls and data.
Review Your Blocked Numbers List
It's worth a quick check to ensure you haven't accidentally blocked the number you're trying to reach. Open your Phone app and tap the three-dot menu in the top-right corner. Select "Settings" and then "Block numbers".
Scroll through the list. If you find the number there, tap the minus (-) icon next to it to remove it from the block list.
Ensure Mobile Data is Enabled
While calls typically use the voice network, some carriers use VoLTE (Voice over LTE) which relies on your mobile data being active. Go to Settings > Connections > Mobile networks.
Make sure "Mobile data" is switched on. If you're traveling, you might also need to enable "Data roaming" here, but be aware of potential charges from your carrier.
Try Switching Between 5G and 4G
Sometimes, the 5G network in your area might be congested or have spotty voice coverage. You can try forcing your phone to use 4G LTE, which is often more stable for calls. Go to Settings > Connections > Mobile networks > Network mode.
Instead of "5G/LTE/3G/2G (auto connect)", select "LTE/3G/2G (auto connect)". Test to see if your calls go through. This is also a good tip for conserving battery life if you don't need the 5G speed.
Check and Re-seat Your SIM Card
A loose or dirty SIM card is a common culprit. You'll need the SIM ejector tool that came with your S25 FE. Gently push it into the small hole on the SIM tray on the bottom edge of the phone to pop it out.
Remove the SIM card, gently wipe the gold contacts with a soft, dry cloth, and then reinsert it firmly. Push the tray back in until it clicks. If you have another phone, you can test the SIM card in it to see if the problem follows the card.
Update Your Software
Software updates frequently include fixes for network and calling issues. Connect to Wi-Fi, then go to Settings > Software update > Download and install.
If an update is available, follow the prompts to install it. Your phone will restart. It's a good habit to check this monthly, as Samsung releases regular updates for the S25 FE.
Reset Your Network Settings
This will erase all your saved Wi-Fi networks, Bluetooth pairings, and cellular settings back to default, but it won't touch your personal data like photos or messages. It can resolve deep-seated network configuration errors.
Go to Settings > General management > Reset > Reset network settings. Tap "Reset settings" and enter your PIN or password if prompted. After the phone reboots, you'll need to reconnect to Wi-Fi and re-pair Bluetooth devices.
Contact Your Mobile Carrier
If you've tried everything here, the issue might be on your carrier's end. There could be a network outage in your area, a problem with your account, or your SIM card might be faulty.
Call their customer service from another phone if possible. They can check for outages, reprovision your line on their network, or send you a replacement SIM card, which often solves persistent calling problems.
