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Apple admits error with iPhone 4's signal strength indicator

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July 2, 2010

The iPhone 4, like all the models before it, has been using a faulty formula to display si...

The iPhone 4, like all the models before it, has been using a faulty formula to display signal strength

Apple has announced that for years, iPhones have been using a “totally wrong” formula to determine how many bars of signal strength they are receiving. The company recently made the discovery after receiving complaints about sudden drops in signal strength, from users of the new iPhone 4. As it turns out, the signal strength itself wasn’t dropping – instead, the phones had initially been displaying the signal as much stronger than it actually was. In a letter issued to iPhone owners, Apple stated, “Their big drop in bars is because their high bars were never real in the first place.”

While some people had previously blamed the reception problem on users’ hands blocking the 4’s integrated antenna, Apple maintains that it’s a software formula issue, and one that has apparently been present since the first iPhones came out three years ago. The company stated that within a few weeks, the problem will be fixed with a free software update for its 3G, 3Gs and 4 models.

Full text of Apple Letter:

Letter from Apple Regarding iPhone 4 Dear iPhone 4 Users,

The iPhone 4 has been the most successful product launch in Apple’s history. It has been judged by reviewers around the world to be the best smartphone ever, and users have told us that they love it. So we were surprised when we read reports of reception problems, and we immediately began investigating them. Here is what we have learned.

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. What can explain all of this?

We have discovered the cause of this dramatic drop in bars, and it is both simple and surprising.

Upon 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.

We will issue a free software update within a few weeks that incorporates the corrected formula. Since this mistake has been present since the original iPhone, this software update will also be available for the iPhone 3GS and iPhone 3G.

We have gone back to our labs and retested everything, and the results are the same— the iPhone 4’s wireless performance is the best we have ever shipped. For the vast majority of users who have not been troubled by this issue, this software update will only make your bars more accurate. For those who have had concerns, we apologize for any anxiety we may have caused.

As a reminder, if you are not fully satisfied, you can return your undamaged iPhone to any Apple Retail Store or the online Apple Store within 30 days of purchase for a full refund.

Via: Apple.

About the Author
Ben Coxworth An experienced freelance writer, videographer and television producer, Ben's interest in all forms of innovation is particularly fanatical when it comes to human-powered transportation, film-making gear, environmentally-friendly technologies and anything that's designed to go underwater. He lives in Edmonton, Alberta, where he spends a lot of time going over the handlebars of his mountain bike, hanging out in off-leash parks, and wishing the Pacific Ocean wasn't so far away.   All articles by Ben Coxworth
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6 Comments

So the [AT&T] signal won't improve, we'll just see accurately how bad it is? I think I'm in love!

bramachari
3rd July, 2010 @ 08:43 am PDT

Well, the cynical would say that they're just making this up to avoid a class-action lawsuit....

alcalde
3rd July, 2010 @ 02:29 pm PDT

LOL - just 2 days ago I read the same thing, except it came from pro-android hackers who reverse engineered the apple code to discover they've been faking the strength all this time.

This part of their letter is the clue: "AT&T's recently recommended formula". There's an agreed standard for how to represent signal strength, and the hackers made a big deal out of this... which I guess is why Apple creatively interpreted that as "recently recommended". Sorry I lost the original URL - here's one talking about it though:

http://www.metalev.org/2010/07/android-vs-iphone-4-signal-strength.html

christopher
4th July, 2010 @ 07:21 pm PDT

Well it has been said by apple that there is no problem in the signal but the bar was giving the incorrect reading.But such types of errors are not the part of apple.

What is your opinion.

Waiting for reply!!!!!

Warm Regards

Barbara
5th July, 2010 @ 01:51 pm PDT

The fact that the signal strength meter lies doesn't change the experience iPhone 4 owners are encountering: touch the two antenna strips together and you drop calls and lose data transmission. All this means is that instead of dropping from 4 bars to 0, it should be dropping from 1 or 2 bars to 0. The design is still flawed.

The fanboys will never admit it, but the great Job's obsession with style finally found him with his nuts in a wringer.

bobmeyerweb
5th July, 2010 @ 05:20 pm PDT

Different mapping does not address the issue of hand contact interference. Those rubber bands should be free if they eliminate the problem , not 30 dollars.

foghorn
5th July, 2010 @ 05:39 pm PDT
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