There are a few different approaches you can take to implement network country detection on Android, but one of the simplest is to use the TelephonyManager class

1. First, you need to include the following permission in your AndroidManifest.xml file:
```
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
```

2. Then, you can get the TelephonyManager instance in your Kotlin code:
```kotlin
val telephonyManager = getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
```

3. Use the `getNetworkCountryIso()` method of the TelephonyManager instance to get the country code:
```java
val countryIso = telephonyManager.networkCountryIso
```

4. You can use the country code to determine the country name using the Locale class:
```java
val locale = Locale("", countryIso)
val countryName = locale.displayCountry
```
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