It's possible (it just has to produce valid xhtml, which at 5 years out, it should be able to do), but I wouldn't bother. The iphone and all the other modern smartphones out there pretty much killed off .mobi before the insanity took hold.
The idea of .mobi was to have sites specifically designed for web phones, which at the time had very limited browsers. .mobi domains were controlled, meaning that you site had to pass inspection for the requirements of .mobi phones. Then the iphone and all the others came along that had pretty powerful, useable browsers that do just fine without needing the .mobi regulations.
Combine that with stylesheets that can be written specifically for phones, printers... gives the publisher (you) the ability to tailor your existing site to cell phones without having to create a completely separate site. Combine that with server side scripting that can sniff what kind of browser is being used and deliver a custom version of the website. There are just better ways to have a mobile website than to build a completely separate site.
The .mobi concept pretty much violates a concept in publishing known as as single sourcing. You don't want multiple copies of stuff to maintain, because more often than not, one becomes out of sync with the other..
So now I'm confused. I want to make a simple mobile site since half our customers use these phones to do everything. I think they will help with our last minute bookers for the tours.
I have bought iphone domaines and had already purchased .mobi domaine.
I thought they both could be pointed to the same site by my webmaster.
I thought I could create one site for both iphone and.mobi
RIki
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Partly that's my point. If half your customers are using iphones or some equivalent, they don't really need a special site, they can use your current site ... though it would be better if your current site. The iphone and many of its competitors have fully functioning browsers so they don't really need special sites just for them.
Long term you would be better off just tuning your main site to eliminate as many browser width issues as you can so that your main site works best with all of the possible browsers. That way you only have one site to maintain, one site to promote, one site to get seen by anyone who is looking for you or what you have to offer.
Technically you could develop a .mobi site and also a bunch of other sites and point them all at your .mobi site, but the question would really be "why?"
Cell phone are in a way different than desktop/laptop browsers. In the the realm of personal computers, designers still have to contend with 800x600 screens because a few people still use them. Screen sizes have a way of persisting a while due partly to people who don't upgrade often, and partly to people who even if they have a large high res monitor still set it to 800x600 because they need that for visual reasons.
When cell phones with browsers first entered the marketplace they had 60 x 90 screens or 120 x 200 The first people to have them were early adopters. When the iphones and iphone variants hit the market the early adopters were still the ones that grabbed them, and their old phones went by-by. There is not a collection of ludites wandering around surfing on the old 120x200 screens the way there are still people using 800x600 computers. The turnover for new phones is much more rapid. There are probably a bunch of reasons why the turnover is faster: phones are more prone to damage, phones are used as status symbols, cell providers encourage you to trade-in or upgrade your phone every year or 2, the cost of a cutting edge phone is much less than a cutting edge computer...and the list goes on.
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