iPhone 4 WiFi Problems - Unable to Connect to Network
OK - thought I'd share my experience so perhaps I can save someone HOURS of frustration if their iPhone WiFi suddenly stops working.
I've been through Apple tech support for hours trying to get my iPhone 4 to work with WiFi.
My issue was that suddenly, after weeks of no problems with home WiFi at all, suddenly it stops working.
I notice there are a few more neighbors wifi networks in range now, so possible interference...anyway - that shouldn't matter right, but after weeks of no wifi problems, suddenly I get the dreaded 'Unable to connect to Network' error and can't use wifi on my iPhone 4. That's what I use most on my iPhone....so very very frustrated.
So, after hours of troubleshooting with Apple tech support (and I mean HOURS), including restoring my phone to factory defaults (and losing data in syncing and having to restore everything etc etc)...playing with internet sharing on my Mac and PC, changing modems and WiFi routers (yes - I had more than 1 handy) and removing, changing and re-adding security settings on my router, they tell me the phone is faulty and take it back to where I bought it. Doesn't sound right coz my iPhone can SEE my wifi network, it just can't connect with that annoying 'Unable to Connect to Network' error message looping me back to my network password prompt.
Anyway, so I take my phone back to store and guess what - finds and connects to their wifi straight away. Sooooo, now I know at least its a local network problem and probably a problem with my wireless router (airport as part of TimeCapsule - fyi)....even though all my other wirelss devices (laptops etc) connect fine.
Anyway, so I find a related article posted in MacTalk to do with a slow/intermittent connection problem and though the symptoms are different, it at least suggests a fix I haven't yet tried.
Fix is to go into Wireless settings in your WiFi router and change the 'Channel' setting from Auto to Manual and then to select the highest channel available (13 in Australia - typically only 11 in US I think). Anyway, as soon as I do this and reboot my WiFi router - BAM - back on wifi at home.
Thank you, thank you, thank you to Brett05 for pointing me in the right direction on that one.... (post is here)....Crap that was frustrating me.
So guys...I think this could be a v.good 1st port of call for any home wifi issues you're having with your iPhone.
I had a similar issue with my iMac. When I first setup my wifi network, I could pick up two or three neighbours networks. But a couple of years later when I got the iMac, and it was having a lot of issues staying connected. I walked around my house with my laptop and i could pick up over 10 wifi networks. So, like you I changed to a different channel and all was fixed. haven't had the issue for over 12 months now.
Ok, my iPhone4 showed my home wifi connection, and had a tick beside it... but stayed showing 3G rather than the wifi symbol. I wasn't getting any error messages though. Just tried the above (although had to Google where to find the channel setting on my Bigpond Tompson router - turns out Bigpond actually has a step by step guide on how to do this!) and now I have wifi again on my iPhone Thanks so much!
Just wanted to say a BIG THANK YOU you have sorted my problem, I even had apple send me a new phone because of this problem.
I hope you have sent your findings to apple, I don't understand IT that much but surely they need your expertise and thought processes on their team.
Got home tonight after work, and sat down to browse the internet on the iPhone 4 (which had been working perfectly until tonight), when the wireless connection dropped. Switched off phone, back on again, nothing. Checked my wife's 4 and the iPad, all working well, it was just my phone. Googled many a site, done a factory reset, nothing seemed to work. Found this page and changed my router to channel 12 (13 was a bit flaky for me) and all is working perfectly!!
Many many thanks for posting this up! I was ready for throwing it out of the window
My wife's IPhone experience the same problem while my new IPhone worked just fine. Her phone won't access the home wifi service through our UVerse connection. I didn't call tech support but did a google search "iphone 4 can't logon to wifi". This brought me to your MacTalk forum. We didn't have an error message and it showed connected to the 3G but even after turning that off in the settings page it still won't connect to the wifi in the home. My IPhone 4 worked just fine. I noticed that it wasn't posting the IP information under the DHCP fields. I went to the wireless router and unplugged the power for 20 seconds and after it reset my wife's phone obtained the wifi network just fine. Who knows why??? Bottom line it that it worked.
Thank you, scouty_lugs, for this fan-freakin'-tastic information. Your post rocks like fox in socks!
Thank you, Brett05, for pointing scouty_lugs in the right direction.
I do not know if all American routers only go up to channel 11, but my parents' Belkin wireless g router only goes to 11.
My problem was not with my home wifi connection, but connection to my parents' wifi network. After working fine for about a day during this visit (and working normally during previous visits), I received the "Couldn't connect to network" message.
Commence basic troubleshooting measures.
Check work computer---it's still connected to my parents' wifi network and my work VPN.
Commence search on Internet for possible fixes.
Find this fantastic thread. Wait for father to finish his morning surfing. Change channel on router to 11 and restart router.
Re-enter password to wifi network on phone: success!
Reconnect work system to wifi network and VPN: success!
Create MacTalk account to give props to scouty_lugs and Brett05 for their awesome possum posts.
Side note: At Christmas my nephew couldn't connect to my parents' wifi network with his iPod Touch. My sister-in-law frequently has problems connecting her work computer (a PC) to my parents' wifi network. I'm curious to see if my change to the router will help either of their connectivity issues.
Tried switching my router to a different channel and this appeared to solve my wifi problem. One thing I thought worth mentioning - here in Japan you can go up to channel 14 on a router, but it appears that the iPhone (4S in my case) can't see this channel at all, so don't use it if it's available on your device.
Check out the Router's Wireless MAC Filter. Your iPhone Might be blocked on Your WiFi
I just registered to share this note. I have an iPhone4 and it was connecting to my home wifi smothly. All of a sudden it could not access my home wifi . Any other wifi is OK. I checked many possible solutions even removing the wifi passowrd did not work.
I noticed I did not change the admin password of my router. It was the default one so anyone could have access to the settings of my router. To my surprise I checked the Wirelss MAC Filter under the Wireless Tab of my router. I found out that one MAC address was there in the Prevent from accessing my network. I then checked my iPhone4 's MAC address (Goto Settings>General>About and its listed there). It was the SAME. I don't know how this happened but I immediately removed the MAC address of my iphone from the Router's Prevent List. It ALL works perfectly. AFTER THAT< i changed the router admin password from the ADMISTRATION TAB.