Apple: It’s Just the Formula for Signal Strength That’s Wrong with the iPhone 4

Apple Addresses Antenna Issues with Public Letter

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Apple has released a public letter addressing the antenna issues with the iPhone 4, which have dominated the tech press since the device’s release.

The company says it has been very surprised to hear so many reports of reception problems and that it has been investigating them. Here’s an excerpt from the letter:

To start with, gripping almost any mobile phone in certain ways will reduce its reception by 1 or more bars. This is true of iPhone 4, iPhone 3GS, as well as many Droid, Nokia and RIM phones. But some users have reported that iPhone 4 can drop 4 or 5 bars when tightly held in a way which covers the black strip in the lower left corner of the metal band. This is a far bigger drop than normal, and as a result some have accused the iPhone 4 of having a faulty antenna design.

At the same time, we continue to read articles and receive hundreds of emails from users saying that iPhone 4 reception is better than the iPhone 3GS. They are delighted. This matches our own experience and testing…

And here’s the explanation and plan of action that Apple has come up with…

iPhone 4 from AppleUpon investigation, we were stunned to find that the formula we use to calculate how many bars of signal strength to display is totally wrong. Our formula, in many instances, mistakenly displays 2 more bars than it should for a given signal strength. For example, we sometimes display 4 bars when we should be displaying as few as 2 bars. Users observing a drop of several bars when they grip their iPhone in a certain way are most likely in an area with very weak signal strength, but they don’t know it because we are erroneously displaying 4 or 5 bars. Their big drop in bars is because their high bars were never real in the first place.

To fix this, we are adopting AT&T’s recently recommended formula for calculating how many bars to display for a given signal strength. The real signal strength remains the same, but the iPhone’s bars will report it far more accurately, providing users a much better indication of the reception they will get in a given area. We are also making bars 1, 2 and 3 a bit taller so they will be easier to see.

Will this be the end of this saga? There is still the matter of those lawsuits.

What do you think?

Apple: It’s Just the Formula for Signal Strength That’s Wrong with the iPhone 4
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  • http://www.itgwebhosting.com Guest

    How hard is it to calculate signal bars..

    Lets break it down, your signal strength can be anywhere from -51 (which is a good strong signal) to -119 (ball park on the high end) .. so lets assume it is -51 to -119, the difference from those two numbers is 68.

    Lets assume that we have a 5 bar meter on the cell phone, and lets use our number of 68. 68 divided by 5 gives us 13.6, so for every 13.6 of signal that we have, lets get rid of a bar, because remember we are dealing with a negative number, not a positive number in actual signal strength.

    So if you have a -51 through -64 then show 5 bars, -65 through -77 show 4 bars, -78 through -91 show 3 bars, you get the idea…

    Now seriously, how hard is that?

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