How can I put my iPhone in field test mode / check antenna signal strength in dB?

Field test mode is a special mode that changes the cellular signal strength bars on your iPhone into numbers for more accurate antenna signal measurement. To see signal strength in dB instead of bars follow these instructions:

1. Your iPhone must be running iOS 4.1. Upgrade if necessary.
2. Open the Phone app.
3. Dial *3001#12345#* on the Keypad and touch Call.
4. Your iPhone is now in field test mode.
5. To exit press the home button.

Smaller negative numbers indicate a weaker signal (for example -110 is worse than -50).

Lawsuits Mount as Apple Works on iPhone 4 Software 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."

Top 10 iPhone 4 Bugs, Issues and Complaints

Cupertino, we have a problem. With over 1.7 million iPhones sold in just three days, Apple's production capacity is at its limits. With so much innovative technology packed into such a small device, there are bound to be some lemons. Many customers have received their iPhone 4 and have no issues, while others have hit the support forums and message boards to voice concerns.

apple iphone 4 glitches

Problems range from inconvenient to completely unfixable. The iPhone 4 comes with one free year of AppleCare, which means that one visit to the Genius Bar can help. With so many iPhones hot off the factory floor, its not guaranteed that even replacement hardware won't have issues of its own. Here's a list of the top 10 iPhone 4 bugs, issues and complaints to watch out for when you receive your shipment from Apple.

How do I put my iPhone 3G / original iPhone (2G) into DFU / recovery mode?

To put your iPhone into recovery (DFU) mode:

1. Make sure the iPhone is plugged into your computer.
2. Turn the iPhone off.
3. After the iPhone shuts down hold down the sleep button for three seconds.
4. While continuing to hold down the sleep button press and hold the home button.
5. Keep both buttons pressed for 10 seconds.
6. Release the sleep button but keep the home button pressed.
7. After a few seconds iTunes will say it has detected an iPhone in recovery mode.


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