The uChek urine analyzer app for iOS devices has come under fire from the U.S. Food and Drug Administration. The FDA has sent a letter to BioSense Technologies asking why their app hasn't been cleared with the agency. The uCheck app allows users to check their glucose and other analyte properties by using the iPhone's camera to read urine strips.

This is the first time a medical app has drawn the attention of the FDA, according to Bloomberg. The FDA says uCheck requires additional approval because it reads test strips made by Siemens AG (SIE) and Bayer AG (BAYN). The agency also believes there needs to be stricter rules for apps that replace existing medical devices, or that directly diagnose medical conditions.

“We intend to finalize the guidance this year,” Synim Rivers, an agency spokeswoman, said yesterday in an e-mail. “The FDA has proposed a regulatory approach that limits its immediate oversight to a specific, small subset of mobile medical applications that are medical devices and present the greatest risk to patient safety if they don’t work as intended.”

Four weeks. That's how long the latest Best Buy iPhone sale will go on once it starts on Sunday, May 26. So what is the store offering to new customers who sign a two-year contract? No less than $50 off every iPhone 4, iPhone 4S, or iPhone 5 purchased during the sale period.

The great news is the $50 off deal applies to your choice of three different wireless carriers, AT&T, Sprint or Verizon. According to AllThingsD, Best Buy is also offering discounts on several Android smartphones for one week from Sunday May 26 to Saturday June 1. Unlike these deals, the sale on all iPhone models will continue until June 22.

Box, a company that creates cloud sharing software and hosting for businesses and individuals, has just acquired a mobile app called Folders. Folders was created by the French developer Martin Destagnol, who has been working closely with Box to fine-tune the integration between Box and the Folders technology. The Folders design and code are becoming a part of Box for the next-generation of the Box iOS client.

Folders allows a user to view and open files, stream audio files, mark notes, preview photos, and view source code. Combining this with Box brings a whole new level of innovation to Box's cloud sharing software.

Electronic Arts' mobile division has released Tetris Blitz to the U.S. App Store. Blitz offers a new twist on the classic puzzle game. Players must race against the clock to score as many points as possible before time runs out. The game features easy one-touch and swipe controls, plenty of fun and interesting power-ups, and hours of replay value.

I originally thought Tetris Blitz was just another flashy, button mashing time killer, but it can be an addictive strategy game. Especially if you attempt to climb the leaderboards, which reset every week. The game's multiple power-ups, finishers, and Frenzy mode make it a fun mobile app that new and old Tetris fans will love.

A new fee has already been applied to AT&T wireless customers starting at the beginning of this month. Contract subscribers will see an increase of $0.61 per month, per line for a Mobility Administrative Fee. According to The Verge, AT&T told them the fee will "help cover certain expenses, such as interconnection and cell site rents and maintenance."

For those who don't feel like doing the math, this amounts to a total of $7.32 per year for the new fee. In a household with four AT&T cellular phones, the total additional cost for four lines amounts to $29.28 per year. While this may not sound like much for the average iPhone customer, AT&T stands to gain close to half a billion dollars from the charges.