GPS.........kinda

The two major hardware changes to the iPhone are the inclusion of a 3G cellular modem and support for Assisted GPS (A-GPS). Despite what many have interpreted the name to mean, A-GPS is not in any way an inferior type of GPS, it’s simply a bit more efficient.

The deal here is that A-GPS relies on cellular data as well as an assistance server to help pinpoint where the A-GPS receiver is, when conditions are less than optimal. The standard iPhone can get a general idea of where you are based on what cell tower you are connected to, but the iPhone 3G with its A-GPS support can actually pinpoint you with much greater accuracy.

The fact that the iPhone 3G’s GPS is A-GPS isn’t its shortcoming, it’s the software that’s the problem. Like the original iPhone, the iPhone 3G ships with a version of Google Maps that works incredibly well with the iPhone’s multi-touch interface. Google Maps on the iPhone is almost as useful as a standalone GPS thanks to the speed of the interface, the problem is that you need a second person using it if you’re driving as it will give you turn by turn directions but won’t speak them to you.

The iPhone 3G unfortunately doesn’t fix this problem - the Google Maps software is identical to what shipped on the original iPhone. The iPhone 3G’s A-GPS will pinpoint your exact location, but it won’t combine with the turn-by-turn directions to automatically guide you to your destination. You still need to manually advance the directions. If you’ve got a someone with you, this is enough to make the iPhone 3G an even better car-navigation tool but if you’re alone it’s not much better than the old iPhone.


No GPS


GPS in action, precision baby

With the app store and the 2.0 SDK there’s a great chance that someone will come along and develop a voice-guided turn-by-turn navigation system for the iPhone 3G, but there is always the chance that it’d be something AT&T would want to sell as a service. Given that Apple has already ceded power to AT&T with the way the iPhone 3G is sold, I doubt there’s much Apple could do if AT&T really wanted to charge for such a thing.

The A-GPS is also currently used by both first and third party applications to help improve the experience. If an app tries to use the A-GPS you must first tell it that it is allowed to use your location (a process that is honestly very Vista User Account Control-like, but I get the security benefit). The iPhone Camera app can use the iPhone 3G’s A-GPS to tag your photos with geographical data, while applications like Urbanspoon can use it to help find restaurants nearby.

The only other major complaint I have about the iPhone 3G’s A-GPS is that it appears to be a CPU hog as the entire Google Maps interface stalls a lot more with it active. Thankfully it doesn’t appear to remain active after you’ve quit Google Maps (hooray for no background tasks?), but this is further proof that Apple needs more processing power in the iPhone. Intel had better hurry up with its Atom strategy, the iPhone is ripe for such a powerful core...

Battery Life Please Get This Thing a Faster Processor
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  • buckdutter - Friday, August 22, 2008 - link

    AT&T's coverage could indeed be better, but then again they are still rebuilding from when they decided to switch from TDMA to GSM, instead of following the natural path to CDMA, which Verizon, Sprint, and Alltel (soon to be Verizon) use, as well as many more localized carriers. The problem with CDMA is that it is going nowhere. The majority of the world is GSM, and CDMA is becoming more and more marginalized, in fact in the next 4 or 5 years CDMA will be practically phased out in the US. Verizon (and Alltel) will be switching to LTE, a GSM based technology which will be a rough transition - either resulting in sacrificed coverage, or more expensive devices (like Verizons expensive "world edition phones") that will run on both their networks. Either way, they will be doing what AT&T (Cingular, whatever) did 4 or 5 years ago, and much later in the game.

    Meanwhile AT&T will make a natural transition from their 3G, which is in all fairness not nearly as widespread as EVDO at the moment, to LTE. Sprint will be going WiMax. Not one major carrier in the US or abroad has made a commitment to the future of CDMA. Verizon has held on to EVDO as long as it could, and has prolonged having to switch, but they are beginning to hit the limitations of EVDO, meanwhile 3G is just getting started, with AT&T planning to follow suit of carriers abroad and boost the speeds to around 20mbps in mid-2009. EVDO will be topping out around 3.2 at most, if even that.

    While having used all the services I strongly disagree with saying that Sprint or T-Mobile even come close to AT&T for coverage, it is largely regional subjective, and is really not fair to work in experiences in one localized area into the review for the phone. Like them or hate them, AT&T recognized early that GSM was the roadmap to go. Like it or hate it, blame Verizon for delaying the inevitable for so long...it makes no sense for Apple to make a CDMA phone when it is so limited in implementation globally. Because of that decision they are the most widespread GSM provider in the US (the US was a little late in getting into the GSM game).

    In the end, AT&T may have a lot of ground to cover, but we should be excited what at least one U.S. carrier took the leap and is building out a GSM network in the states, even though it meant making the sacrifice of less coverage in rural areas as they build the new network out. It will be interesting to see how Verizon copes with having to change over.
    Reply
  • Hrel - Tuesday, August 12, 2008 - link

    Over 2 years the new iphone plane costs an extra 60 bucks, but the upfront cost is 300 dollars less. The iphone 3G is less expensive in every way; even with the incremental increase in contract cost. I'm confused that I need to point this out considering you say it in your article then contradict yourself by saying the old plan and phone was less expensive. Total cost over two years the new one is 240 dollars less. Reply
  • maxnix - Thursday, July 31, 2008 - link

    With no user replaceable battery, it is a toy, not a reliable business device.

    It seems to me that 90% of the users I see are fiddling about on it with their fingers and not even 10% use Bluetooth. Are there still no voice driven commands? That's how I use my phone.

    Seems like a great device for someone who wants to make calls on their iPod when they are not listening to a lossy audio source.

    Jobs is the new PT Barnum in that he fully exploits the "A sucker's born every minute..." credo. The world is full of lemmings.
    Reply
  • maxnix - Thursday, July 31, 2008 - link

    Welcome fanboys to AT&T's limited 3G. The rest of the world has been there for 5 years. Reply
  • steveyballmer - Wednesday, July 23, 2008 - link

    Sprint or whoever has released the perfect smart phone! It's based on Windows Mobile and is beautiful to behold!
    There is nothing else anything like it! The Instinct!

    The ZunePhone has suffered a few setbacks so this will have to do until we work out the bugs. Buy it! Don't be decieved by that imitation iPhumb.

    http://fakesteveballmer.blogspot.com">http://fakesteveballmer.blogspot.com
    Reply
  • Lezmaka - Monday, July 21, 2008 - link

    I think there's a fairly obvious (to me anyway) reason why the talk time measured is almost half the time the specs state, beyond the best case scenario stuff.

    In most conversations, there's a significant amount of dead air. Even if it's only 1/10 - 1/4 of a second at a time, over the course of several hours, that will add up. But with most music, there's almost no dead air. Even when the person isn't saying something, there's at least some sound being generated. Detecting that dead air and not transmitting would probably be the best for battery life, but even if it continually transmits, the compression would reduce the amount of data transmitted to almost nothing.

    I would guess that choosing an audio source that more closely matches an actual conversation would provide a somewhat more accurate test result. But I'm not expert, so what the hell do I know?
    Reply
  • Giacomo - Monday, July 21, 2008 - link

    Ehm... No man, there's no way this could influence battery life. No matter how intense is the information in the call, most of the energy drain is due to the "line" itself... Keeping the full-duplex conversation online.

    Everything else left to the battery is the loudspkeaker consumption... But it's a ridicolous amount, you won't be able to measure its impact.

    Giacomo
    Reply
  • donhoffman - Tuesday, July 29, 2008 - link

    Actually the original commenter on this was correct. This is a time-honored technique for getting more battery life out of cell phones. Channel allocation for voice calls is done at call setup. A continuous data stream is not needed to keep up the "line". If either end of the call has nothing to send, it does not need to transmit, saving significant power. The technique used in this article probably does underestimate the battery life. Not by 100%, but maybe 20-30%. Transmit power is much larger than audio power. That is why you get 24 hours listening to music on the iPod side, but only 5 or so hours doing cellular phone calls.




    Reply
  • nichomach - Sunday, July 20, 2008 - link

    Not wishing to get into whether the new iPhone is all that, I'd note that the enforced PIN code when using Exchange is usually a policy setting defined in Exchange, and there's a choice about enabling it. That choice'll be made by your Exchange admin(s). If they enable it - personally, I do - then I'd expect it to be enforced on any device that claims to support Activesync. One of my arguments with Nokia's Mail for Exchange client, for instance, is that it doesn't (or didn't) properly support policies like that; that the iPhone does makes it a viable choice if I end up with a director demanding one. If you're using your phone in a corporate environment, then you may be sending and receiving confidential stuff. Enforcing a PIN and supporting remote wipe properly is the sine qua non as far as I'm concerned. Reply
  • Schugy - Sunday, July 20, 2008 - link

    Openmoko will have the best 3rd party support while Nokia and Google (Maemo / Android) have their own ressources. But regarding their openness they are evil. The FIC Freerunner is a nice phone but the Openmoko project still has to develop a lot.
    On the other hand I think that a Open Pandora handheld with a USB HSDPA modem (maybe builtin in future revisions) is a lot more usable and even has game controls. Telephony and navigation could be done via a bt headset+voip and gps receiver.

    All the platforms will feature ports of killer apps like pidgin IM, scummvm, evolution e-mail and lots more. Ports of gnash, the GNU flash player, are possible too but I would suggest to get rid of these stupid and annoying banner ad players. A nice stream or download link for mp4-files will make your full featured (fullscreen / post processing filters) mplayer happy.
    Reply

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