Most dotmobis are worthless at the moment. The mobile internet hasn't even begun to take off and all high prices you hear about are merely speculative purchases. That being said, your name isn't a very good speculative purchase so I'd recommend just holding onto it for the time being.
If you want to try and cash in before the Internet really peaks on cell phones, here's my recommendation:
1. Don't buy names about anything you know nothing about
2. Research the market of what you plan on buying into --> sometimes you'll find better worded domains this way by using synonyms, etc.
Words like: invest, investor, stock, buy, sell, buying, selling, auctions, trading, business,...
When your word can be applied to anything, it's much more valuable. Invest could mean investing in stocks, it could also mean investing in dotmobis. Maybe it would make a good cell phone site helping people decide which cell phone to 'invest' in next?
Now, obviously these words are taken -- they're arguably some of the best names in any extension. However, look for words with similar meanings, perhaps synonyms, perhaps with prefixes or suffixes added...
If you stray away from that, I'd recommend sticking with things applicable to cell phones. If you take a look at dnjournal.com's recent data -- typos can be very, very good domain names
