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Apple To Issue a 'Fix' For iPhone 4 Reception Perception

Lisandro and several other readers let us know that Apple has just released a statement addressing the signal issues a lot of users are having with their iPhone 4. They claim to have discovered the cause for the drop in bars, which is "both simple and surprising" — a wrong formula used to calculate how many bars are displayed for a given signal strength. "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. ... 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. ... 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." Wired notes that there is still a signal drop when the iPhone 4 is gripped in particular ways.

12 of 534 comments (clear)

  1. These aren't the bars you're looking for... by ender1598 · · Score: 5, Funny

    Just force hold it next to your ear like the rest of us!

    --
    There are 10 kinds of people in the world; those that understand binary and those that do not.
  2. bars by mark72005 · · Score: 5, Funny

    Well, AT&T does say "More bars in more places"

  3. Programming is so easy by DoofusOfDeath · · Score: 5, Funny

    that Marketing fixed the bug!

    short compute_bars(double signal_strengh_dB) {
      # Original approach. Not sufficiently diplomatic. -John from PR
      # return min(0, max(5, log(signal_strengh_dB));
     
      # Better approach. - John from PR.
      # Commenting this out. You're an idiot. Display only has 5 bars. -Dave from R&D.
      #return 11;
     
      # This makes me feel dirty. -Dave from R&D.
      # Wrong code. See correct fix at bottom of function. -Steve
      # return min(3, max(5, log(signal_strengh_dB));
     
      # Simple, elegant. You guys suck at programming. -Steve
      return reality_distortion_field( signal_strengh_dB );
    }

  4. Anand Tech by ChipMonk · · Score: 5, Informative

    There's a serious analysis here, with some extra commentary by OS News here.

  5. Re:I wonder... by ZeroExistenZ · · Score: 5, Funny

    Does anyone get the impression they started looking for any excuse for their crap design and this was the best they could come up with?

    "We need to do something QUICK! The media is raging on this issue! Even the general media!!! Even ads are mocking us!"
    "We can design an isolation band to put on the phone, and market it as the next fashionable thing"
    "people would rage it's not free and would cost too much to ship out to everyone.. any other idea's?"
    "Recall! Redesign! WE HAVE NO CHOICE"
    "TOO EXPENSIVE! and we just fired our antenna guys."
    programmer: "I can write a tool to detect if they're lefties by usage stats..."
    "... listening."
    "And then adjust their reception display."
    "What do you need?!"
    "5 hookers, one masseuse, 2 days of coding and unlimited supply of skittles."
    "GIVE THIS MAN WHAT HE NEEDS! Get to work! Good job."

    --
    I think we can keep recursing like this until someone returns 1
  6. Re:Joke by Chrisq · · Score: 5, Funny

    An iPhone walks into a bar... oh wait it was a guy walks into a bar and leaves his iPhone

    He probably had a similar problem to the iPhone when he left .... seeing two bars when there should only be one.

  7. Re:Actual formula change by eln · · Score: 5, Insightful

    They are not solving the problem as reported, they are redefining the problem to something they can fix without a hardware recall.

    The problem as reported is that the signal strength weakens consistently when the phone is held in a certain way. This is clearly a hardware issue, but hardware issues are expensive to fix. So, Apple fixes a similar but ultimately unrelated problem via a much cheaper software patch and hopes their loyal fan base will just pay attention to the fact that *a* problem has been fixed, even if it isn't *the* problem everyone is complaining about.

    Unless Apple honestly believes this software patch will fix the actual reported problem, which I find very difficult to believe, they are acting in an unethical and customer-unfriendly manner in order to avoid the real solution, which would be to issue a recall of their flagship product and fix the hardware.

  8. Re:Formula change by msauve · · Score: 5, Informative

    With digital phones, it's not necessarily signal strength (cell phone parlance = RSSI, Received Signal Strength Indication) you want to display. You want to include some measure of the signal/noise ratio, since that is a better indicator of a phone's ability to communicate.

    And, in fact, that's what most cell phones do. For CDMA, it's usually some combination of Ec/I0 with signal strength, and for GSM it's some combo of reciprocal bit error rate combined with signal strength. Often time averaged and perhaps peak reading. So it's not just a simple "x dB RSSI = y bars" calculation. The combined metric is called SQE (Signal Quality Estimation).

    --
    "National Security is the chief cause of national insecurity." - Celine's First Law
  9. Anandtech may have an explanation... by JorDan+Clock · · Score: 5, Informative

    Anandtech posted a review of the iPhone 4 the other day and they have a break down of the signal strength in dBm compared to how many bars are displayed. The specific page is here.

    Basically it looks like there is a huge range for what is considered five bars, and a small range for the remaining four bars.

  10. RSimple solution - return it. by tomhudson · · Score: 5, Informative

    It's Defective by Design (TM)

    For once, Apple copied Microsoft.

    Check the consumer protection legislation in your area. It probably has something along the lines of products needing to be fit for the purpose for which they were purchased for a reasonable length of time, taking into account the price paid.

    There are two types of warranties: Legal and Conventional.

    Conventional Warranty (limit your rights): We warrant foo for 1 year (no warranty on batteries, screens, keyboards, accessories, etc).

    Legal Warranty: Fitness for purpose for which it was purchased, taking into account price paid, etc. In other words, you paid $3k for that big-screen tv and it croaked 1 day after your conventional 1-year warranty expired? You can still use the legal warranty via small claims court. They can't hide behind the limitations of the conventional warranty - the conventional warranty is in addition to the legal warranty (which makes extended warranties stupid purchases).

  11. Unhappy campers - Please take Apple's advice. by calstraycat · · Score: 5, Insightful

    To all the folks unhappy with both the performance of the new iPhone and Apple's response, please heed the advise in this portion of the press release:

    "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."

    Seriously. Please.

    All this ridiculous, over-the-top, self-righteous indignation and emotional hand-wringing over a gadget not meeting your expectations is just pathetic.

    Apple has taken a stand on this issue. They say it works as designed and claim the reception is better than their previous model. You think they're full of shit? Great. Quit posting whiney, indignant messages on the internet and return the goddam thing.

    If the problem is half as bad as all the stories make it out to be, Apple will be flooded with returns and that will have a much greater effect that millions of lines of internet bitching.

    Disclosure: I'm a satisfied owner of several Apple products. I don't own an iPhone and have no plans to purchase one. My wife and I have free-with-subscription LG phones on Verizon. Oh, and guess what? If I hold the phone by the bottom, signal degrades. If I hold it that way in an area with poor cell coverage, service is lost entirely. You think if I submit my sob story to Slashdot, Gizmodo, CNET, CNN, etc. they will make it front page news?

  12. Re:Formula change by DJRumpy · · Score: 5, Informative

    Yes and no. The issue had to do with the scale used. From AppleInsider:

    "Apple's iOS allots nearly 40 percent of reception levels to five bars, from -51 dB to -91 dB. But the distance from four bars to one bar of reception is much less, from -91 dB to -113 dB."

    Unless you live under a rock, or have never cracked open ANY cell phone manual, you would know that they all recommend avoiding the lower left side where the antenna is located. The problem with Apple's configuration is that they used 5 bars for -51 to -91 db, which in itself is fine, since any call with those signal strengths would be very stable.

    The problem has to do with dropping signal strength when you cover the antenna. Although you couldn't cause any phone to lose 63 db from grabbing it, getting a 20 db drop in signal strength isn't all that uncommon. If someone was in the weaker 5 bar range (say -90 db), which is still a decent signal, the phone would display 5 bars. When you covered the antenna, you could potentially get a 20 db drop, bringing you down to -110 db, which is a very poor signal. It gave the impression that someone went from 5 bars to no bars, or even no service (no service being very possible with -110 db).

    There are no standards defining what dB is represented by the number of bars. It is totally up to the hardware manufacturer. As to whether or not this was a mistake, who can say? The haters will claim it's a marketing ploy, the lovers will claim it's a fair way to rate the signal. I'll probably fall in between.

    What this fix will do is better represent the number of bars by signal strength in a more linear fashion, so that -90 might only be three or two bars, and covering the antenna would drop you to 1 or no bars. Although any phone might make a call at 1 bar, you should also expect that you might drop it with such a poor signal.

    Frankly, I think most of the posts in these and other forums are full of 'noise' from people who hate Apple, from Droid fans, to people who just dislike them for their closed systems. It's an ideal way for them to take shots by spreading FUD and making the issue appear far worse than it actually is. Unfortunately, it also makes it much more difficult for people to judge the scope of the problem, which in itself is a win for Droid from a marketing perspective. I do know that I haven't dropped a single call on the iP4 regardless of the bar display. I suspect most fall into the same category. Reviews of the phone also back up the same. Dropped calls have actually been reduced under the iP4, regardless of the number of bars displayed. Anandtech actually has a nice write up and some more thorough testing of signal strength. What they found is that the exposed antenna's do make the iPhone 4 more susceptible to interference, but not so much that it would affect people with decent signal strength. It actually performs better than a droid for signal loss when it's in a cover:

    http://www.anandtech.com/show/3794/the-iphone-4-review/2

    The Antenna is Improved
    From my day of testing, I've determined that the iPhone 4 performs much better than the 3GS in situations where signal is very low, at -113 dBm (1 bar). Previously, dropping this low all but guaranteed that calls would drop, fail to be placed, and data would no longer be transacted at all. I can honestly say that I've never held onto so many calls and data simultaneously on 1 bar at -113 dBm as I have with the iPhone 4, so it's readily apparent that the new baseband hardware is much more sensitive compared to what was in the 3GS. The difference is that reception is massively better on the iPhone 4 in actual use.

    With my bumper case on, I made it further into dead zones than ever before, and into marginal areas that would always drop calls without any problems at all. It's amazing really to experience the difference in sensitivity the iPhone 4 brings compared to the 3GS, and issues from holding the phone aside, reception is