I have a few options on my phone and wouldn't
DREAM of whipping one out at a poker table:
-- slows game trenormously
-- shows everyone you're
that serious about poker
-- indicates to everyone that there are odds to consider
-- teaches them which apps to use
-- raises the level of acceptability of those sorts of tools
very bad for poker.
One of the main ways you're competing with other poker players is your ability to absorb lessons learned away from the table and apply them on-the-fly. Are you better at tracking the pot size? Then it's bad for you if everyone has some easy-to-use pot size readout. Better at evaluating your opponent's style? then it's bad for you to have HUDs breaking down player stats.
OK, that said, there are some tools that allow you to analyze poker off the table. I went through a phase of playing face-up poker hands "solitaire". It's a f*** ton of work, believe it or not. I used my phone for part of it.
first of all, the best HOLDEM equity calculator is of course pokerstove, but that doesn't exist online or on the phone.
A close 2nd, imo is twodimes.net, with the huge factor of being able to evaluate many other games. Use a standard web browser on your phone.
there are ap equity calculators:
Poker Odds Evaluator -- hand vs hand only, no ranges. very simple and fast interface.
PokerOdds -- does ranges, but the interface isn't pokerstove. (same author also has an omaha calc, I haven't tried it).
For ICM calcs, there's an android ap called "
ICM Calculator". very nice. I use the same one on my laptop. [note-- I have, once or twice, used the ICM calc at the end of a tournament when a few very sophisticated players were contemplating a chop.]
Don't forget
blindvalet's ap. That's one my poker buddies are used to seeing on my phone, because it's awesome and ok in public. (but beware! the timer stops when you turn the screen off

)
I haven't kept up-to-date to see if there's newer entries. It was about a year ago I went looking for this stuff. Hopefully somebody follows up with awesome newer tools...