If you’ve ever upgraded from one cell phone to another, you have likely had to swap your SIM card: the tiny chip that pops into a storage slot in your device to connect you to your carrier’s cellular network. Increasingly, though, phone manufacturers and carriers are skipping physical SIM cards altogether in favor of a digital alternative.

eSIM — or embedded SIM — is a digital SIM card that is built into your device and can be activated virtually, no manual switch required. Most flagship smartphones in 2025 support eSIMs.

Here's what you need to know about eSIMs, and how they can be a real help when you travel overseas.

Nomad eSIM: Travel is freedom at its finest, and eSIMs complement that freedom. No complicated roaming plans. No more trying to keep track of a series of physical SIM ca

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