Get code Adsense to mobile webpage

To generate your Adsense for mobile ad code, first follow these step:

1. Sign to your account at www.google.com/adsense
2. Select the Adsense Set Up Tab.
3. Choose Adsense for mobile content as your product.
4. Follow the guided wizard to choose the format of your ad unit, the markup language, colors, and any channels.
5. 
   From the "server-side scripting language" drop down, choose your scripting language.
6. Copy the ad code in the "your Adsense Code" in its entirety.
7. Paste the code into the source of your moblile webpage in the location where you'd like to appear.

Once you've added the code to your page and saved your changes, relevant ads should appear within 48 hour.
From: Adsense support