What is eSIM? Basics in One Page

What is eSIM?

eSIM (Embedded SIM) = a digital SIM built into your phone.
You use it by receiving a carrier profile via QR code or app—no physical USIM card.

• Install: Scan QR or download profile from provider app (usually Wi‑Fi required)
• Activate: Use “at install” or “when connected locally” depending on plan
• Form: No card, so less worry about loss or damage

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Pros

• Travel: Install before departure, use data as soon as you arrive
• Often cheaper than roaming
• Keep home number (USIM) and use data on eSIM only (dual SIM)
• Easy to switch countries and plans without swapping cards

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Cons / Precautions

• eSIM-compatible device required (e.g. iPhone XS+, Galaxy S20+)
• Many plans cannot be reinstalled after deletion → check before deleting
• Turn off data roaming on home USIM to avoid high roaming charges

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Travel flow

1. Purchase → Choose country and data on eSIMoa (or similar), pay
2. Receive QR/code → Delivered by email or app
3. Install → Add eSIM profile to phone on Wi‑Fi before departure
4. Activate → Use data after arrival (or immediately, depending on plan)
5. Data line → In Settings, set “Cellular data” to eSIM

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Learn more

• eSIM in detail
• eSIM compatible devices
• eSIM plans comparison