
Casinos in Las Vegas have been warned by Nevada Gaming Regulators about Blackjack Card Counter ($3.99, iTunes link), an iPhone app which helps players track and take advantage of the probability odds in blackjack.

Card counting is not illegal in Nevada, but using an electronic device such as an iPhone to aid in counting cards is a felony. California gaming officials were the first to hear reports of the app being used in Indian casinos in northern California.
Blackjack Card Counter offers four popular types of card counting strategies: Hi-Lo, Hi-Op I, Hi-Op II, and Omega II. There is also a stealth mode in which the iPhone’s screen goes black, but you can continue to press the +1, +2, -1, -2, and New Deck buttons to keep track of the count. You can back out of stealth mode by tapping the top half of the screen.

A vibrate feature was recently added to alert the card counter when a certain value is reached, ie, the probability advantage is in their favor.
There have been no official reports of the app being used in Las Vegas yet. Policy about cell phone usage at gaming tables is decided by the individual casino operator.
Blackjack Card Counter is a $3.99 download in the iTunes App Store.

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