NFC turned on?
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That can be very frustrating, especially when you need to make a quick payment! The issue with credit cards not working on your Samsung S24 usually relates to the mobile payment system (Samsung Wallet/Pay or Google Wallet) and the phone's NFC (Near Field Communication) feature.
Here are the most common steps to troubleshoot and fix this issue:

Basic Troubleshooting Steps
1. Check NFC Status:
Swipe down from the top of your screen to open the Quick Settings panel.
Make sure the NFC icon is turned on (it should be illuminated). If it's on, try tapping it off and then on again to refresh the connection.
2. Check Default Payment App:
Go to Settings \rightarrow Connections \rightarrow NFC and contactless payments.
Tap on Contactless payments.
Ensure your preferred app (e.g., Samsung Wallet or Google Wallet) is selected as the default.
3. Remove and Re-add the Card:
Open your payment app (Samsung Wallet or Google Wallet).
Remove the credit card that isn't working.
Restart your phone.
Re-add the card to the app. This often resolves minor authorization or data issues.
4. Restart Your Phone:
A simple restart can clear temporary glitches that affect the app or the NFC sensor.

Advanced Steps & Specific Situations
Check Phone Placement:
The NFC sensor on the S24 series is typically located near the rear camera area. When paying, make sure you are placing that specific part of the phone directly onto the contactless reader, and hold it there briefly.
Check Your Phone Case:
Certain third-party phone cases, especially thick ones or those with magnetic clasps/card slots, can interfere with the NFC signal. Try removing your case and testing a payment.
Clear App Cache:
If a specific payment app is malfunctioning:
Go to Settings \rightarrow Apps.
Find and tap on your payment app (e.g., Samsung Wallet/Pay or Google Wallet).
Tap Storage \rightarrow Clear cache. (Do NOT tap "Clear data" unless you want to completely reset the app and remove all your cards).
Check with Your Bank:
Sometimes, after switching to a new device (like the S24), your bank may require you to re-verify or reactivate the card for mobile payments. Call your bank/card issuer to confirm the card is properly provisioned for your new phone.
If you have tried all of these steps and the issue persists, you might have a problem that requires more specific support.
Would you like me to help you find the support contact information for Samsung or for your specific payment app (Samsung Wallet or Google Wallet)?