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One possible solution to iPhone Wi-Fi problems iOS devices
Does your iPhone constantly defer to 3G or 4G, even when you are standing right next to your Wi-Fi router?

I recently discovered that the two iPhones (a 3GS and a 4S) in my household were both deferring to using 3G and 4G instead of using Wi-Fi. All the other devices (two laptops, one iPad 2, and two Direct TV boxes) were doing just fine.

I looked all through many tutorials online and tried a number of weird tricks and resets and was getting pretty flustered about it. Then I looked into why it would be affecting out phones and not our other devices and found this:

Pre-iPhone 5 models do NOT support the newer 5GHz Wi-Fi spectrum. All the other devices in my house, including the iPad2, DO support the 5GHz Wi-Fi spectrum. This means that the only devices using the 2.4GHz range on my router were the two iPhones.

I logged into my router's control panel to have a look at the 2.4GHz settings. At first I was considering changing its security settings from WPA2 to WPA Enterprise, but first I decide to try something simpler. I changed the 2.4GHz channel setting from "Auto" to a dedicated channel, and everything was back to normal.

I wish I could provide an explanation for why this worked. It seems there are many of people having this issue. I hope this helps you if you are.

[kirkmc adds: It is entirely possible that there was interference from other people's routers on the channel you were using. By changing the channel, you found one that is less encumbered. But this is certainly something to try if you are having Wi-Fi connection problems, and not just with an iPhone

5GHz is not really "new," it's just not been supported by mobile devices for very long. I've had a 5GHz network in my home for a few years, even though, for a long time, only my Macs would connect to it.]
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One possible solution to iPhone Wi-Fi problems
Authored by: The_App_Guru on Sep 28, '12 08:36:13AM

Actually both of you are wrong. It's pretty clear the issue is an IP conflict.....in other words two devices on your network are sharing the same IP address. Therefore, when one device is logged on the other device gets kicked and connects back to cellular. Once you changed the router's settings from "auto" to whatever other channel, the router reboots to make the change. Upon restart the router sees the second device attempting to connect to the wifi connection and adds another IP address for the new device, that the router didn't previously recognize as a new device. Same thing happen to me a while back....a constant issue with iPhones on DHCP connections. Assign a static IP address on both iPhones for your wifi network and you won't have this issue anymore.....

Your welcome!!! 8^D



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One possible solution to iPhone Wi-Fi problems
Authored by: unforeseen:X11 on Sep 28, '12 11:40:08AM

Just to mention, 5GHz dual-band is the reason I bought a new AirPort Express this summer. In my apartment building, my iMac would constantly lose internet connectivity with 2.4GHz, probably because I get around 30 networks and my base station is in another room. This problem goes away with 5GHz but as the hint mentions, iPhones < 5 will not be able to connect. Dual band solves this by running 2.4GHz and 5GHz channels simultaneously; there are many different base stations out there that support it, the recent AirPort Express is now one of them.

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One possible solution to iPhone Wi-Fi problems
Authored by: petersconsult on Oct 02, '12 06:23:38AM

Also, you have to look at the security scheme...

Most WiFi routers/APs offer either WPA2 or WPA or the WPA/WPA2 hybrid...

What i've observed is that, most of the time, the WPA/WPA2 does *not* play well with a lot of hardware....

Your mileage may differ; i usually go for WPA2

i hope this helps!!
Peter



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One possible solution to iPhone Wi-Fi problems
Authored by: txoutback on Oct 02, '12 08:57:13AM
Original Poster here,

Thanks everyone for the followups. My nearest neighbor is 1/2 mile away, so I'm fairly certain there was no wifi interference from them...but you never know. Other devices in the area like utility smart meters, point-to-point internet (neighbors use that, I have a T1), or satellite TV equipment could have been interfering on some level too.

The IP address conflict might have been the issue which was resolved naturally when I changed the channel on the WiFi...not sure if changing the channel resets the DHCP or not. I kinda recall seeing an alert on my iPhone once about such an IP address conflict, and I was definitely not seeing it when my troubles started...[can anyone confirm whether or not iPhones have an IP address conflict alert?]

Sometimes different security protocols are definitely better than others...that's what I was going to try and change, even though it had run trouble free for a long time before this.

I know LOTS of people have been having problems like this... do a google search and you'll find pages and pages of rage over phones insisting on 3G/4G over wifi. I'm really relieved to have stumbled onto a fix worth trying, whether it be channel related or I simply forced DHCP to get its act together be accident.

Cheers.

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One possible solution to iPhone Wi-Fi problems
Authored by: zo219 on Oct 10, '12 07:46:21PM
Could this have anything to do with the over 200GB of data AT&T claims I used last month when I always have cell data furned off, having a perfectly good wi-fi network, MacBook Pro and wi-fi iPad 2, should the urge to download overcome me?

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