iOS4.01 released (updated with before and after pictures)


As you can see from the screenshots, my iPhone 3GS has a lot less signal bars after the update! What was your experience of the update to iOS4.01? Let us know in the comments or the forums!

This update contains bug fixes and improvements, including the following:

• Improves the formula to determine how many bars of signal strength to display

Products compatible with this software update:
• iPhone 3G
• iPhone 3GS
• iPhone 4

For feature descriptions and complete instructions, see the user guides for iPhone at:

For more information about iPhone, go to:

To troubleshoot your iPhone, or to view additional support information go to:

This update contains security content originally included in previous iOS Updates. For more information, please visit this website:


About the author


John is a long time fan of all things apple, coffee and life.

1 Comment

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  • My signal strength has not changed at all with this update. Still all full bars, but the first signal bar is higher up. Seems as if they want you to think you have a stronger single bar of reception than before.

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