Well before that, let’s talk about having mobile web site or an app ?

When evaluating which tactics or delivery methods to use, consider that consumers are connecting to the Internet with their devices increasingly through Wi-Fi rather than through the cellular networks, even 3G networks. This is significant. This means that many devices — from the iPhone to the iPod Touch to Sony PSP, Nintendo DSi, and others (though not yet the Kindle) — are being used on high-speed Wi-Fi networks in places even more diverse than where cell coverage allows interactions. We are seeing an increasing number of connections occurring from home where Wi-Fi is common and on campuses and in public Wi-Fi locations. This means more moments when consumers will interact and get better user experiences, which keeps them active and coming back for more.

Regardless of app or mobile Web site, one thing we’re seeing is enormous data and functional usage of smartphones compared to the old-school mobile phones. Smartphone owners like their devices a great deal, making them huge users of the mobile Internet and mobile search engines. They also use their smartphones to shoot photos and videos and share this content and to engage with apps. Because people with smartphones typically use their devices to the fullest, they are a great audience despite their smaller numbers.

But consumers can access mobile Web sites through almost any mobile browser, so it’s not limited to a particular device, operating system, or manufacturer.

So at the end of this, SEO your mobile web site, and build an app if you sell content or products.