Using a wap browser you will not be able to access the Web Trader. I agree that this would be a good feature for mobile trader but am not sure what amount of development would have to be done to accomodate that.
My best suggestion would be to submit a request on the IB Feature Poll requesting this. The more votes it gets the more likely time will be allocated to implementing the request. I would suggest searching it first to see if there is already a request out there that you can vote on.