How to consistently check if GPS is enabled

Hi! I hope someone from the community can help us out. We have an ongoing thesis which is a scavenger hunt-type of game in android and it also needs GPS to be activated. Now I already have a code for the initial error if GPS is not enabled yet once the user launches the app:

 private IEnumerator StartLocationService()
     {
         latitude = Input.location.lastData.latitude;
         longitude = Input.location.lastData.longitude;
 
         if (!Input.location.isEnabledByUser) 
         {
             Debug.Log ("GPS IS DISABLED");
             errorPanel.SetActive (true);
             if (PlayerPrefs.GetInt ("LANG") == 0) 
             {
                 warningMessage.text = "GPS is not enabled. Please activate GPS and try again.";
                 retryButton.text = "Retry";
             }
             if (PlayerPrefs.GetInt ("LANG") == 1) 
             {
                 warningMessage.text = "Hindi nakabukas ang iyong GPS. I-activate and iyong GPS at subukang muli.";
                 retryButton.text = "Ulitin";
             }
             Debug.Log ("GPS is not enabled");
             yield break;
         }
 
         Input.location.Start(10, 0.1f);
         int maxWait = 20;
         while(Input.location.status == LocationServiceStatus.Initializing && maxWait > 0)
         {
             yield return new WaitForSeconds(1);
             maxWait--;
         }
 
         if (maxWait <= 0)
         {
             errorPanel.SetActive (true);
             if (PlayerPrefs.GetInt ("LANG") == 0) 
             {
                 warningMessage.text = "System has timed out. Please try again";
                 retryButton.text = "Retry";
             }
             if (PlayerPrefs.GetInt ("LANG") == 1) 
             {
                 warningMessage.text = "Ang system ay nag-time out. Subukang muli.";
                 retryButton.text = "Ulitin";
             }
             Debug.Log ("Timed out");
             yield break;
         }
 
         if (Input.location.status == LocationServiceStatus.Failed) 
         {
             errorPanel.SetActive (true);
             if (PlayerPrefs.GetInt ("LANG") == 0) 
             {
                 warningMessage.text = "System is unable to determine service location. Please try again";
                 retryButton.text = "Retry";
             }
             if (PlayerPrefs.GetInt ("LANG") == 1) 
             {
                 warningMessage.text = "Hindi matukoy ng system ang iyong lokasyon. Subukang muli.";
                 retryButton.text = "Ulitin";
             }
             Debug.Log ("Unable to determine device location");
             yield break;
         }

Honestly, only the first if condition is the only function that works and im so confused as to how the GPS functions but one of my main concerns is how can I do it so the panel would always show up if ever the user decides to disable it again after enabling the GPS.

Thanks and cheers!