Linktela — a precise guide to eSIM, profiles and activation

01 — Cover story Fundamentals

Installed, enabled, active: three states people confuse

A profile can be downloaded without being enabled, and enabled without being active on a network. The distinction explains most “it says it is installed” support conversations.

By Elias Roth8 November 20267 min read

Devices

IMEI checks and the myth of the locked phone

4 min read

Diagnostics

A short taxonomy of connection failures

6 min read

Networks

Latency, throughput and what to measure

5 min read

Scope

Linktela is a technical reference, not a provider. It describes how eSIM systems generally behave; device implementations and operator terms vary. Verify specifics against your own documentation.

Latest entries

Five references

Fundamentals

eSIM, eUICC and profile: a precise explanation

The chip, the operating system inside it and the thing you download are three different objects. Naming them correctly makes every other guide easier.

By Nour Haddad·4 November 2026·8 min read

Devices

The IMEI check, and why “eSIM-ready” is not a guarantee

Marketing pages describe families of devices. Your handset is a specific model with a specific configuration.

By Katrin Vogel·31 October 2026·5 min read

Activation

Activation states and the order of operations

Install, enable, connect, register. A state model that turns a confusing settings screen into a sequence.

By Elias Roth·25 October 2026·6 min read

Diagnostics

A taxonomy of connectivity failures

Six failure classes, from no coverage to a misconfigured APN, each with a distinct signature and a first test.

By Nour Haddad·20 October 2026·9 min read

Measurement

What travellers can reasonably measure on mobile data

Speed tests are a hobby, not a diagnostic. Three simple observations tell you more about whether the connection is usable.

By Katrin Vogel·15 October 2026·5 min read

01
What is an EID?
Definition · 1 min
02
Does an eSIM survive a factory reset?
Explainer · 2 min
03
Can two profiles be enabled at once?
Explainer · 2 min
04
What is an SM-DP+?
Definition · 1 min
05
Is tethering controlled by the profile?
Explainer · 3 min

Glossary

Six terms that do most of the work

A compact reference. The longer glossary sits in the topics section below.

eUICC

The soldered chip that can hold multiple mobile profiles. It is the hardware formerly known as an embedded SIM.

Profile

The operator data package you download. It behaves like a removable SIM, but lives inside the eUICC.

EID

The identifier of the eUICC itself. It is not the same as an IMEI, which identifies the phone.

SM-DP+

The server that prepares and delivers a profile. It is the address encoded in a QR code.

Enabled

The profile is switched on in the device. It may still be outside coverage or not registered.

Roaming

Using a visited network. The home operator must have an agreement, and the device must allow data roaming.

Topics

Four starting points

Fundamentals

The objects and standards behind the word eSIM.

Devices

Model numbers, locks and regional variants.

Activation

States, sequences and the role of the network.

Diagnostics

Failure classes, signatures and first tests.

The eSIM, defined precisely

Installed, enabled, active: three states people confuse

IMEI checks and the myth of the locked phone

A short taxonomy of connection failures

Latency, throughput and what to measure

Latest entries

eSIM, eUICC and profile: a precise explanation

The IMEI check, and why “eSIM-ready” is not a guarantee

Activation states and the order of operations

A taxonomy of connectivity failures

What travellers can reasonably measure on mobile data

Six terms that do most of the work

eUICC

Profile

EID

SM-DP+

Enabled

Roaming

Topics

Fundamentals

Devices

Activation

Diagnostics