7 Replies Latest reply: Jul 19, 2008 7:05 AM by steve copeland
Bryan Debnam Level 1 Level 1
I would like to see the edge antenna take priority for voice, then auto toggle 3G when surfing GPS and so on. I have a hunch this toggling would improve battery like. I think the Treo works in this fashion. Where does that nify link reside?

2.4 ghz 24' Imac, Macbook, Iphone g3 16 gb white, Mac OS X (10.4.4), OSX and Vista Ultimate
Reply by Allan Sampson on Jul 18, 2008 7:06 AM Helpful
http://www.apple.com/feedback/iphone.html

All replies

  • Bryan Debnam Level 1 Level 1
    Here is a link with some good suggestions for improving battery life. Turning the brightness down, disable EQ, lock in one minute etc...

    http://www.apple.com/batteries/iphone.html
  • steve copeland Level 1 Level 1
    Can I just point out that is exactly what happens...... 3G is the date element of the connection not the voice. voice still goes over the standard voice channel. This is how you can surf and talk at the same time unlike on the edge network where voice and data are carried over the same channel.
  • Bryan Debnam Level 1 Level 1
    Apple states 1/2 the talk time on 3G. I can not imagine that 3G only saps more battery life for data and not voice.I suspect the antenna is drawing more power whenever I see that nifty 3G icon. Which is 90% of the time for me.

    iPhone 3G offers up to 5 hours of talk time on 3G, 10 hours of talk time on 2G,1 5 hours of Internet use on 3G2, 6 hours of Internet use on Wi-Fi,3 7 hours of video playback,4 or 24 hours of audio playback5 on a full charge at original capacity. In addition, iPhone features up to 300 hours of standby time.6
  • steve copeland Level 1 Level 1
    Far be it for me to disagree with you as I only have 15 years working in mobile networks..... But yes it does. 3G is always on and exchanging data with the network. Edge is a reactive protocol and effectively 'dials' the connection every time you make a data demand. That is how edge works over the top of the voice channel.

    When the 3G icon disappears it is because you are out of range of a 3G signal but the chip is still hunting for a connection and will consume power.

    I suspect this is why Apple went 2G in the first place and only went 3G as a result of market pressure. 3G devices have always had terrible battery requirements.
  • colmdc Level 1 Level 1
    Not to be argumentative but this isn't correct.

    When your iPhone says 3G it means that it is using UMTS (W-CDMA) for both Voice and Data connections. This is a very different protocol and works over different frequencies than GSM.

    When your iPhone says EDGE then it is using the GSM network for Voice on a GSM Cell that supports EDGE specific data enhancements to increase data throughput over normal GSM data (GPRS).

    Finally when your iPhone doesn't say EDGE or 3G then it is on a GSM Cell that doesn't support the EDGE data enhancements.

    So really the 3G iPhone has to choose between two different Cellular technologies, 2G (GSM) or 3G (UMTS) and the device can't communicate on both of these technologies at the same time.

    Have a read of the wiki pages for more information:
    UMTS (WCDMA): http://en.wikipedia.org/wiki/WCDMA
    GSM: http://en.wikipedia.org/wiki/GSM

    Hope this clears things up.
    -- Colm.
  • steve copeland Level 1 Level 1
    Actually it is correct but depends on where you are based. I am giving the UK angle.

    3G networks in general are notorious power drains, but the network type used by AT&T is particularly power-hungry because voice calls use the same mobile broadband network as data tasks. In contrast, the EvDO technology on which Sprint and Verizon base their 3G networks supports data only; voice uses older CDMA networks, which (in theory at least) use less power.