The Samsung Galaxy S24 supports both physical SIM cards and eSIM technology. Here are the key points to consider:

- The Galaxy S24 is listed among the Samsung devices that support eSIM, which means you can use an eSIM from a Portuguese carrier if they support this feature.
- The phone also has a traditional SIM slot, so you can use a physical SIM card from a Portuguese carrier if you prefer.

However, it is crucial to ensure that your device is not locked by a carrier, as a locked device may not support eSIM or may have restrictions on using SIM cards from other carriers. You can check the carrier lock status on your device by going to Settings > General > About and looking for the “Carrier lock” section.

In summary, the Galaxy S24 should work with your Portuguese SIM card, whether it is a physical SIM or an eSIM, provided the device is unlocked and the carrier supports eSIM technology.