Try WSOP Hold’em Legend: iPhone OS and Android OS / $0.99
This game originally released at $2.99, and at that price was a great deal, but at $0.99, it’s a no-brainer. This is by far the best poker game ever released for a mobile device. You start out as an amateur and work your way up to play in the biggest tournaments in the world. You can also build up your bankroll in cash games.
There’s multiplayer support if you are on WiFi or 3G against six or nine players.
You can even have a peer-to-peer heads-up match via Bluetooth. If you are looking to get your poker fix in at lunchtime or while waiting at the doctor’s office, this is the perfect app to invest your money and time in.
Yes, there are a number of poker rooms that allow you to play real money poker on both Android and iPhone 4's. http://www.pokerroomcompare.com/ currently list 3 different real money poker rooms that support both Android and iPhone poker.
Bwin - they provide native apps for both iPhones and Androids.
Terminal Poker - This is a high speed web app that can be used on both iPhones and Androids.
Switch Poker - This is another web app that can be played on iPads, iPhones and Droids.
Accoring to www.iPhonePoker.net a new real money poker app has been launched for the iPhone 4S and any Android smartphone. mFortune, who are a UK mobile casino, have developed a Texas Holdem app that works on almost every smartphone.
I've tried it and it's reall good. What's great is that you don't require the Flash player which means it can be played on any mobile device, even the iPhone.