Water is gold - the ad

This was an ad released last year by Zain, a highly successful telecom. company in the Middle East. They always have great ads. This one in particular was such a hit. It has a great meaning that had nothing to do with telecom. but nonetheless worked in their advantage.
The ad was directed to children to conserve water. It tells a story about the life cycle (and adventures) of a single drop of water, how it evaporates to steam and turns into a drop of rain. It finally tells the kids that "water is gold" and basically, don't waste it. The song was written by Heba Mishari Hamada from Kuwait.
All the kids loved this ad, they'd wait for it to come on TV so they'd sing along or dance to it. Soon enough it caught on with the grown ups too. It became really popular so fast. All the parents, brothers/sisters, even aunts and uncles came to know it from the kids. Its such a catchy song, everyone was singing it. Kids were nagging parents wanting to watch on YouTube. A lot of people had it as ring tones, and they'd bluetooth it to all of their friends. The ad itself is really cute, highly relevant, and completely successful.
When a brand releases an ad like this; innocent, great moral... it gives the public a positive idea of the what kind of brand it is. People may associate the good qualities of an ad like this to the brand itself, thus trusting it more. And when it comes to a competitive field like telecom., trust would be an important factor for a customer to differentiate between one company and the other.