eUICC
The eUICC is the secure chip that stores eSIM profiles; one chip holds several, usually with one active, and SGP.22 v3 adds multiple enabled profiles.
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The eUICC is the secure hardware inside a device that stores eSIM profiles and runs the applet logic that enables or deletes them. Most eUICCs enable one profile at a time; SGP.22 v3 adds Multiple Enabled Profiles on chips and devices that support it.
A soldered eUICC, often in an MFF2 package, survives vibration and heat better than a socketed card and cannot be removed by a user. A failed chip is a failed device.
Profiles inside one chip
- Device
- eUICC
- Profile
- Subscription
Text description
The figure lists four parts in order: the device, the eUICC, a profile and the subscription. The eUICC is the secure element inside the device, and the profile is the operator data installed on it. Enabling the profile makes it the active subscription.
Enable and delete are different
Enabling a profile makes it the active subscription; deleting it removes the credentials. Profile slots are finite, so a fleet that keeps old profiles can fill the chip; a deletion policy belongs in the design.
What to check
Confirm the chip supports the required specification family, that firmware exposes the right commands, and that a profile can be disabled and re-enabled without deletion. A certified chip with an uncertified integration is not a certified solution. What is eSIM explains the profile layer.