Adding Admob [Google mobile Ads ] in your Unity3D projects

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Requirements -

• Unity 4.3 or higher
• An ad unit ID
• To deploy on Android:
  • Android SDK 3.2 or higher
  • Google Play services 4.0 or higher
• To deploy on iOS:
• XCode 5.1 or above
• Google Mobile Ads SDK
•  Google Mobile Ads Unity Plugin v2.1

First step - 

Import google mobile ads unity plugin into your project [Assets > Import Package > Custom Package].

Second Step -

For Android -

If you already had an AndroidManifest.xml in Unity project Assets/Plugins/Android/, keep your current version and add the necessary activities and permissions required by the Google Mobile Ads SDK.

Additional dependencies:

 - Add the google-play-services_lib folder, located at sdk/extras/google/google_play_services/libproject [ it is inside ADT file you downloaded from android website], into the Plugins/Android folder of your project.

For iOS

Go ahead build and run your project for iOS. Then in Xcode do the followings -

1. Add the Google Mobile Ads iOS SDK library [ make sure you added into Library folder in Xcode].
2. Add the following frameworks if they aren't already part of the project:
   • AdSupport
   • AudioToolbox
   • AVFoundation
   • CoreGraphics
   • CoreTelephony
   • MessageUI
   • StoreKit
   • SystemConfiguration
3. Add the -ObjC linker flag to your Other Linker Flags in Build Settings.
4. If you got any errors like link-O or link-l when you complied, change search path under Build Setting > Search Paths > Library Search Paths like so (assuming you have saved your project in the desktop) Users/your computer name/Desktop/Project name/libraries.

Third Step -

Type or copy paste followings in the script where you want to call ads -

using UnityEngine;
using System.Collections;
using GoogleMobileAds;
using GoogleMobileAds.Api;

public class adMob : MonoBehaviour {
    private InterstitialAd interstitial;

    // Use this for initialization
    void Start () {
        // Intersitial ads go here
        
        #if UNITY_ANDROID
         string adUnitId = "xxxxxxxxxxxxxx";
        #elif UNITY_IPHONE
         string adUnitId = "xxxxxxxxxxxxxx";
        #endif
        
        
        // Create an interstitial.
         interstitial = new InterstitialAd(adUnitId);
        // Load an interstitial ad.
         interstitial.LoadAd(new AdRequest.Builder().Build());
        // intersitial ads end here.................................
        
        
        //Banner ads start here.....................................
        // Create a 320x50 banner at the top of the screen.
        #if UNITY_ANDROID
        string adUnitIdBanner = "xxxxxxxxxxxxxxxxx";
        #elif UNITY_IPHONE
        string adUnitIdBanner = "xxxxxxxxxxxxxxxxx";
        #endif
        
        BannerView bannerView = new BannerView(adUnitIdBanner, AdSize.Banner, 
                                                 AdPosition.Bottom);
        // Create an empty ad request.
        AdRequest request = new AdRequest.Builder().Build();
        // Load the banner with the request.
        bannerView.LoadAd(request);
        //Banner ads end here
    }
    
    // call this function whenever you want ad to display ex. on game over
    void CallInterstitial () {
        if (interstitial.IsLoaded())
        {
            interstitial.Show();
        }
    }
}

For more information ---

 - https://github.com/googleads/googleads-mobile-plugins/blob/master/unity/README.md

 - http://googleadsdeveloper.blogspot.com.au/2014/05/google-mobile-ads-unity-plugin-21-adds.html

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