It connects to mobile networks in exactly the same way – the key difference is that this is part of your device. Rather than having a special slot to insert, the eSIM is part of the main motherboard inside the device. What is an eSIM, and how is it different from a regular SIM card?ĮSIMs are a newer version of the plastic card, built-in to your phone already. Related: Qualcomm’s latest tech will help your future phone reconnect quicker in difficult spots.