<|im_start|>system
You are a helpful AI assistant.<|im_end|>
<|im_start|>user
How can implement network country detection on android? I am using Kotlin.<|im_end|>
<|im_start|>assistant
Here's an example of how you can implement network country detection on Android using Kotlin:

```
kotlin

import android.content.Context
import android.telephony.TelephonyManager

fun getNetworkCountry(context: Context): String {
    val telephonyManager = context.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager
    return telephonyManager.networkCountryIso.toUpperCase()
}
```

This code makes use of the TelephonyManager class in the Android framework to retrieve information about the device's telephony services. The networkCountryIso property returns the ISO country code of the current registered operator's MCC (Mobile Country Code).

Please note that this code only works on a device that has a cellular connection. If the device is not connected to a cellular network, the networkCountryIso property may be empty or may return the wrong country code.<|im_end|>
<|im_start|>user
What versions of Android does this work for?<|im_end|>
<|im_start|>assistant
That function was deprecated in Android API Level 24 which is the API Level for Android 7.0<|im_end|>
<|im_start|>user
Which one is fastest and optimized?<|im_end|>
<|im_start|>assistant
The method described above is a simple and straightforward way to implement network country detection on Android using Kotlin, but it may not necessarily be the fastest or most optimized solution depending on your specific use case. If you need to optimize the performance, you may want to consider using alternative approaches such as using the Location API or the IP Geolocation API. However, you should weigh the benefits and trade-offs of each approach and choose the one that best fits your requirements in terms of accuracy, speed, and resource usage.<|im_end|>