Really? Let's see...
Symbian... has an SDK and has had for years. Thousands of applications. Also the 'phones it appears on account for about 70% of the smartphone market.
Yeah, they'll be playing catch up.
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Here's news for you: It's a totally different market. They won't dominate for the same reason Macs don't dominate the PC market - price, incompatibility and lock in.
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With all due respect, I think the thing you are missing when the previous poster said that the other phone companies will be playing catch up to the iPhone is, the iPhone's user experience. It's elegant simplicity. THAT's what it's all about and THAT's what the other cell companies will be playing catch up to. Using your statement, "Symbian has had an SDK for years," I would say more importantly, Symbian, Windows Mobile and all of the cell phone makers have had a big head start and many, many chances to do a cell phone right... and look what happens when a company like Apple releases their first cell phone. The buzz, the press, the high user satisfaction. Just about every TV show features one and now all of the other cell phone makers are trying to make their own "iPhone clone" (and failing at it so far.*) There is something to be said for all of that.
(*You can't just add a touch screen and say "This is as good as an iPhone". It's about the convergence of Apple's engineering and design; with multi-touch, their OS X, their software integration, etc. something Apple has been doing for years with their Macs and cell phone companies ARE just now trying to catch up to it; the user experience.)
And it is very much like the iPod market. When the iPod first came out many of the same people that bash on the iPhone had the same argument with the iPod; that there were better MP3 players with bigger storage, cheaper prices and not locked into a certain [Apple's] audio format, and yet with all of that, the iPod STILL took over due to it's elegant simplicity and integration with iTunes... as the iPhone will too.
As for Macs, in case you missed the news, while Apple's laptop sales have been consistently up by 34% for the last couple of years, the rest of the PC laptop industry's sales have been down by 14%, so the Mac line is also gaining market share and will probably have majority share by 2010 if not sooner...