Apple's recent launch of the iPhone Air, the first smartphone in Europe that uses only an eSIM (an embedded SIM card), could signal a shift away from traditional physical SIM cards. An eSIM is a digital SIM that is built into the device and allows users to activate mobile services without inserting a physical card. While eSIMs have been available as an option for international travelers, they are now gaining more attention, especially with the introduction of a smartphone that relies solely on this technology. If other manufacturers follow Apple's lead and produce fully eSIM-compatible devices, the use of physical SIM cards may gradually decline. However, converting from a physical SIM to an eSIM is not always straightforward for all users. First, the smartphone must be compatible with eSIM technology, which is generally the case with newer models. Additionally, users must ensure their device's software is updated. For example, Free mobile subscribers with an iPhone need to be on at least iOS 18.5 to make the switch. It's also important to note that not all mobile operators offer eSIM services, especially virtual operators (MVNOs). Among these, only a few like Prixtel and YouPrice provide the option to purchase an eSIM directly. Before converting a physical SIM to an eSIM, users should be connected to a Wi-Fi network since mobile data is temporarily disabled during the process. To begin, they must access their mobile operator's customer portal and request a new eSIM. This option is often found in the "Troubleshooting" section, and users should specify "Switch to eSIM" as the reason for the request. Some operators may charge a fee, such as 10 euros, for this service, though some, like Bouygues, offer it for free. Once the eSIM is ordered, it can be activated through the customer portal using a QR code scanned with the smartphone. After activation, the physical SIM can be safely removed. Depending on the operator and smartphone model, users may be able to convert their SIM to an eSIM more quickly through the device's settings. On Android devices, this can be done in the "Networks and Internet" menu, while iOS users can navigate to "Cellular Data" and look for a "Convert to eSIM" option. If this feature is not available, users will need to initiate the process through their operator's customer portal. This transition to eSIM technology represents a step toward more seamless and flexible mobile connectivity, but it requires both user awareness and operator support.