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Reference · 2026

eSIM glossary for travelers

Last updated: 2026-05-01 · About 11 min read

Engineering specs intimidate shoppers until boiled down to checkout vocabulary. here is that boiled-down stack.

Jump from terms into activation or hotspot guides whenever concepts demand procedural context.

Hardware identifiers

IMEI fingerprints the handset modem inventory carriers whitelist.

EID references the secure element slot negotiating remote provisioning.

ICCID identifies an installed profile. support bots almost always ask for it.

  • IMEI ≠ ICCID. never paste wrong IDs into refund tickets

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Provisioning vocabulary

SM-DP+ servers host downloadable profiles referenced by QR or manual codes.

LPA (Local Profile Assistant) is the handset-side orchestrator approving installs.

Profile nickname ≠ billing SKU. rename freely for UX clarity.

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Allowances & validity clocks

Calendar validity counts wall-clock days regardless of airplane mode.

Activation-triggered timers begin only once radios attach first time.

Throttle ladders degrade speeds without billing extra GB.

Hotspot vs handset-only buckets

MVNO DPI sometimes meters tether MAC addresses separately.

Personal hotspot menus inherit whichever line owns cellular data defaults.

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Roaming vs local profile myths

Travel SKUs often attach directly to visited PLMNs. still read lawful intercept disclaimers.

Domestic SIM roaming internationally differs technically from prepaid travel profiles.

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Fair use & unlimited marketing

Unlimited promises coexist with acceptable-use PDFs limiting tether throughput.

Daily buckets resetting UTC midnight confuse timezone-hopping itineraries.

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Glossary FAQ

No. IMEI is hardware; ICCID is SIM/eSIM profile identity.

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