# Prepare eSIM Installation

### Check for eSIM capable device

First, you need to check if the device is eSIM capable.

{% hint style="warning" %}
This query may take some time (up to multiple seconds on some devices) to complete. Make sure you wait for the completion before triggering an eSIM installation.
{% endhint %}

```swift
Gigastore.isEsimCapable(completion: { (isCapable) in    
    print("\(isCapable)")}
)
```

{% hint style="info" %}
If a "false" is returned from the query despite the following criteria being met:

* Your [device](https://docs.giga.store/technical-integration/master#supported-devices) is eSIM capable
* You have added the [run script](https://docs.giga.store/installation#attention-1) for your [Info.plist](https://docs.giga.store/installation#info-plist-and-entitlements) and your [entitlements](https://docs.giga.store/installation#info-plist-and-entitlements) file.

Then there is likely another problem.

If this problem persists, **please contact <support@tunz.io>**
{% endhint %}

The `isEsimCapable` method can be used to check whether the user's device is eSIM capable or not.

## Activate Inventory Item using API

{% hint style="warning" %}
Implementation changed with SDK version 1.1.
{% endhint %}

To install an eSIM, an inventory item must first be activated using the Gigastore API on your server. For more information, refer to the [first-package](https://docs.giga.store/api/first-package "mention")API documentation.

Use the **esimProfile.uid** parameter of the API response and transfer it securely to your app.&#x20;

## Retrieve the profile

Use the `getProfile` method with the created profile uid to fetch all needed profile data. \
The method will return a profile you can install in the next step using [Install Profile](https://docs.giga.store/ios/install-profile).

```swift
let profileUID = "123456-abcde-abcde-789" // from API
Gigastore.getProfile(profileUID: self.profileUidValue, 
                     completion: { (profile, error) -> Void in
                         
   print("PreparedProfile: \(profile), error: \(error)")
})                  
```