# Multi-IMSI eSIM

Multi-IMSI eSIM provides reliable mobile connectivity designed for privacy-aware users who want stable internet access without traditional physical SIM cards and without contracts.

It is built for secure browsing and global connectivity, without interruptions.

#### CASTRUM SPN (Service Provider Network)

Conectum eSIM operates under the **CASTRUM SPN** — the network name shown on your device.

Unlike traditional SIM cards that are tied to a single telecom operator, CASTRUM SPN is designed to always prioritize **the best possible connection** in your current location.

Behind the scenes, your eSIM can connect to multiple partner mobile networks.\
The visible provider remains **CASTRUM**, while the underlying operator is selected dynamically.

This means:

* your eSIM is **not locked to one telecom provider**
* the **fastest and most reliable network** is chosen automatically
* switching between networks happens **silently in the background**
* no manual network selection or user action is required

In practice, this results in **better speeds, more stable connectivity, and improved reliability**, especially when moving between cities or countries, all while keeping the experience simple and privacy-aware.

***

#### What Multi-IMSI means

IMSI (International Mobile Subscriber Identity) is the identifier mobile networks use to recognize a device.

With **Multi-IMSI eSIM**:

* your eSIM is not bound to a single, permanent IMSI
* when the network or operator changes, the IMSI can change as well
* long-term tracking across networks becomes significantly more difficult

Unlike traditional SIM cards with a fixed identifier, Multi-IMSI reduces persistent correlation across locations and operators.

***

#### Seamless connectivity when crossing borders

**Real-world example:**

With traditional roaming, crossing a border often means:

* temporary loss of signal
* delayed network registration
* mobile data not working for minutes

With CASTRUM Multi-IMSI eSIM:

* the device automatically switches to a local partner network
* IMSI and operator selection happen in the background
* connectivity continues immediately

There is no “dead zone” where mobile internet stops working, the transition is seamless.

It is designed for users who travel, work internationally, or simply want **reliable and discreet mobile connectivity**.


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