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Turn off "Ask to join networks"...
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Professional Poster
Join Date: Sep 2000
Location: San Francisco
Status:
Offline
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I turned this off this morning just to see how it would effect battery life since it is the setting that Apple uses for their battery tests. To my surprise, this option does not interfere with iPhone's ability to join already known networks--it continues to do this automatically. All it does is prevent iPhone from searching for unknown networks. I assumed it would prevent iPhone from searching out any networks, but it doesn't, just new ones. Going from home to work caused my iPhone to join my work network automatically. Cool.
Anecdotally, I think this has improved my battery life as my charge indicator hasn't dropped at all today. I don't know why it would take more power to search for unknown networks than known networks, but whatever works.
I'm curious as to other people's experiences with this and what they think.
kman
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Professional Poster
Join Date: Feb 2002
Location: Why do you care?
Status:
Offline
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Great! I didn't know it worked like that. Thanks for the tip - I only use my network at home and can manually search if I am somewhere else that might have one.
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Addicted to MacNN
Join Date: Jan 2002
Location: PDX
Status:
Offline
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That makes sense. I believe that when you have it set to automatically search for networks, it does it at a certain interval. I would imagine that this uses a decent amount of battery. Good to know that you can turn that option off and still auto-join your known networks. Great tip!
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Fresh-Faced Recruit
Join Date: Jul 2007
Location: Broken Arrow, OK
Status:
Offline
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Yes, as indicated on the bottom on the settings, it will still automatically join networks it already knows.
The phone automatically switches to EDGE when put to sleep anyway, it's just when you pull it out to check an SMS/etc. that it will fire up WiFi. Since the screen is off, I've yet to test whether or not it is using WiFi to check e-mail if it is available even when the phone is asleep.
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Senior User
Join Date: Mar 2002
Location: CT
Status:
Offline
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Also it will only show you the "Join Wireless Network" dialog if you go to do something that would activaly use the internet, like open Safari or use YouTube. If you are just using the iPod for example it won't prompt you to connect to a WiFi connection, even if its found any. If you have already connected to one that it has found it will just connect you. This is very much unlike most phones that don't take into account what you are doing and provide numerous prompts to connect to found wireless networks.
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