# Configure Mobile Data

### Configure Mobile Data

After installation:

* Enable **Mobile Data**
* Enable **Roaming**

If mobile data does not connect automatically:

Go to:

**Settings → Network & Internet → SIMs → Select your eSIM**\
Scroll down and tap **Access Point Names**

Then:

1. Tap **+** (top right corner)

You are now in the **Add Access Point Name** section.

Configure the following:

* **Name:** Castrum
* **APN:** `mbb`
* Leave all other fields unchanged

2. Tap **Save**
3. Select the newly created APN (filled circle = active)

### SIM Management (Dual SIM Configuration)

Under:

Settings → Network & Internet → SIMs

You can configure how your SIMs are used if you have:

* A physical SIM
* An eSIM

Here you can define:

* Which SIM is used for **Mobile Data**
* Which SIM is used for **Calls**
* Which SIM is used for **SMS**
* Whether both SIMs remain active simultaneously

This allows flexible setups, such as:

* Physical SIM for calls and SMS
* Castrum eSIM for mobile data
* Or full eSIM-only usage

You can change these preferences at any time.

{% hint style="success" %}
Once configured, your Pixel device is ready for secure mobile connectivity via Castrum eSIM.
{% endhint %}


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