For example if you want to trade on the beach with some beautiful women and some cold ones. More specifically I want a cell phone that can trade the e-mini futures.
I've had an iPhone (original version) for quite a while and been happy. TOS has an app out for it now if you use them.
https://www.thinkorswim.com/tos/displayPage.tos?webpage=thinkPodInfo&displayFormat=hide or search iSwimLite in iTunes.
Etrade has their balckberry offer with their streaming quotes and execution for stocks and ETFs, but I dunno if I would try to trade futures over a phone. Spys maybe if you must. https://us.etrade.com/e/t/mobile_pro?SC=NMCFWEB&coid=HP_MINI_C09_T_P_HP_MINILC_Mobile_BB_012209
For TD AMERITRADE users there is iStockManager for the iPhone and the Blackberry Storm (Bold version coming soong). It has streaming data, charts, stock and option trading, and much more. Visit http://www.iStockManager.com to get more info. The Blackberry Storm version is currently in beta testing, anyone with a Storm and a TD AMERITRADE account who wants to try it out can send an email to : blackberry at istockmanager dot com
Verizon Wireless Broadband is quite robust in NYC. With a USB modem on a laptop, you get ~1.5Mb/256k download/upload speed.
with the VZ broadband wireless there is some latency of course so the speeds wont be like you're sitting at home