Vodafone: Thank You

No matter how much communication Vodafone sent customers to stop using paper bills and switch to electronic bill (e-bill), the majority of them never listened or responded.
So they decided to hand from trees huge speech blurbs with personalised thank you messages to all those Vodafone customers who had switched to e-bill. This exercise was carried out in their immediate neighbourhoods. This didn't just acknowledge and celebrate their contribution but went on to inspire thousands of others who walked past these installations.