Yes via Iphone.
But honestly, the beauty these days of either having standing orders already for exits or the ability to use contingent orders, trailing stops means that you can let technology work for you and try and use automation to get trades executed and perhaps take emotion out of your trading.
A good example of this is symbol:GLD which is a gold ETF traded here in the use tracking gold prices.
I have a long entry set to purchase on breakout-once entered system will automatically enter my stop order and sell target order (using triangle pattern target)
If price breaks down my short sale will be entered with subsequent buy stop which will be a trailing stop, and a buy to close target.
thats the beauty of developing trading plans and contingencies.
cheers
Derek