Now that Apple's iAd mobile advertising solution has launched, some may be curious just how Apple intends to target customers with ads geared towards their personal tastes. Turns out that Apple will leverage data collected from 150 million iTunes users to help determine where to place ads.

The apps you download, how long you use them, and which ones you delete delete are all known by Apple, as are any other purchases you make on iTunes. The company does not share this data with advertisers directly, but instead allows advertisers to select from different targeting options based on user preferences. Apple has already sold $60 million in mobile ads for its iAd system.

Ever wondered if you could swap out the micro-SIM card in your iPhone 4 to get free data from AT&T on the iPad 3G? Well stop wondering. Turns out a simple change to APN settings on the iPad makes it possible to use the iPhone 4 data plan on Apple's tablet. No jailbreaking or SIM card modifications required.

As the helpful folks over at TUAW explain, the procedure is quite simple but does involve many small parts. Carefully use a SIM removal tool or paper clip to open the SIM trays on your iPhone 4 and iPad 3G. Don't mix up the trays and keep track of which card came from which device! When the iPhone 4 micro-SIM is safely inside the iPad 3G, all you need to do is make a change to the APN settings on the iPad.

Watch out Apple, Fring has FaceTime in its sights and has launched a new version compatible with iOS 4. What this means for owners of the latest iPhone is they are no longer restricted to Wi-Fi only video chatting. Not only does Fring enable 3G video chat, the company is offering their software for multiple smartphone platforms.

Unlike FaceTime, which only allows video chat between two people who both own the iPhone 4, Fring makes it possible to video chat with anyone running the software and with those running Skype. Currently Fring is available on Android and Symbian phones as well as iOS 4.

Early reviewers were impressed with the improved upload speeds on the iPhone 4 after launch day. Everything has changed starting this weekend, with users around the country complaining that uploads are now having trouble keeping at 100 kilobits per second. Previous reports clocked the new HSUPA chipset uploading at over 15 times this speed.

Sending photos and posting videos becomes difficult with such a slow connection. AT&T has been accused of capping upstream bandwidth without notifying customers, however new information points to a possible software problem. AppleInsider reports that AT&T is working on a fix.

Apple now claims an error in the iPhone 4 firmware is responsible for the dramatic drop in signal bars some have experienced when the device is held a certain way. An update for iOS 4 will be released in the coming weeks to address the problem, but in the meantime several lawsuits have been filed against Apple over the issue.

The most recent suit was filed Friday in the Northern District of California and accuses Apple of false advertising, breach of warranty, and unfair competition among other complaints. The plaintiff, Steve Tietze is seeking class action status for the case and contends that Apple is guilty of "misrepresenting and concealing material information in the marketing, advertising, sale, and servicing of its iPhone 4 - particularly as it relates to the quality of the mobile phone antenna and reception and related software."