I am old school, I love the Atari 2600 games. I know that Stella is a good EMU for Linux, I was happy to find that they have a version for Windows Mobile.
Go to the Stella site and download the version for Windows Mobile. Then unzip it in your phone. and copy over your roms. If you don’t have any Atari 2600 games do a Bittorrent search and you will find some.
Then start the program and Enjoy.
Here is a little movie of my Blackjack.
Here is some more info on BlackJack II must have software.