This app was mentioned in 2 comments, with an average of 2.00 upvotes
I've heard USAA has a really nice app.
Edit: USAA Credit Union
Now that I'm home here's some linkage for you;
USAA; They have excellent customer service and they'll give you 50 free trades for a new account (a pittance IMO) if you make more than 25 ~90 days commission is 5.95 with .75c options (otherwise 8.95 commission). I use USAA out of convience sake personally.mobile
tradeking; They'll pay part of your transfer fees (you might have to use that link i got called a shill for posting) commission per trade is 4.95 options are .65c. mobile site is here
optionshouse; same comission options are .50c. If you use the code FREE150 and put in more than $5K they'll give you 150 free trades mobile is here