you can do it with IB, they provide a web based solution that run on most handheld devices including the latest web enabled cell phones.
Yep. It can run with the pre-installed Pocket IE. It called mobile trader. URL: http://www.interactivebrokers.com/en/software/pdfhighlights/PDF-MobileTrader.php?ib_entity=llc This link will direct you to the address to use in your mobile browser's IE. I use Mobile Trader to check on my account. I've used it for trades in the past and it worked fine.