Gizmodo reports that iOS 4.1 has reincluded the Field Test mode to iOS. Field Test mode allows you to get a numerical figure for your antenna strength rather than the traditional bar measure. To get to Field Mode:
- First, upgrade your iPhone 4 -- or any iPhone -- to iOS 4.1. - Dial *3001#12345#* into your phone [and press Call].
Pressing Home will exit you from the Field Test mode. For reference, Anandtech provides a good discussion about bar strength and signal values. Since that article was published, Apple has remapped the signal strength to # of bar ratio. More negative numbers are worse, and Anandtech reports they were surprised they were able to hold calls with signals as low as -113db.
Most customers won't care about their numerical signal strengths, but the antenna strength changes generated a lot of publicity surrounding the iPhone 4 launch due to issues with new antenna system.
It is now August, and that means the iPhone 18 Pro and iPhone 18 Pro Max are just a month away. The devices are expected to look similar to the iPhone 17 Pro and iPhone 17 Pro Max, but there will still be many year-over-year changes, with rumored features including a smaller Dynamic Island, 5G via satellite, and more.
Apple is expected to unveil the iPhone 18 Pro, iPhone 18 Pro Max, and a...
Thursday August 6, 2026 7:03 am PDT by Joe Rossignol
It is now August, and that means the iPhone 18 Pro and iPhone 18 Pro Max are just a month away. The devices are expected to look similar to the iPhone 17 Pro and iPhone 17 Pro Max, but there will still be many year-over-year changes, with rumored features including a smaller Dynamic Island, 5G via satellite, and more.
Apple is expected to unveil the iPhone 18 Pro, iPhone 18 Pro Max, and a...
We're a little over a month away from the launch of iOS 27, and Apple is continuing to make changes. The fifth beta of iOS 27 changes the look of some app icons and adjusts Liquid Glass, plus it adds some smaller features that make the iPhone just a little nicer to use.
App Icons
There are updated Liquid Glass icons for Safari, Siri, Settings, Remote, App Store, and Preview. Some of the...
Apple's first foldable iPhone, with a book-style design featuring a ~5.5-inch outer display and a ~7.8-inch inner display with a minimal crease down the middle.
