I just had this crap happen to me this morning
iPhone was sitting on a non apple dock, charging. I'm sleeping until my normal wakeup time at 8:00.
At 7:09am, I get a text from AT&T warning of the 90% level. Then 5 minutes later, I get the next text saying I've hit the 100% level and that all data will now be charged.
So obviously the phone used 3G instead of wifi, which was very strong signal seeing as how the wifi access point is not even 20ft from the phone with only one sheet of drywall at a 0 degree angle. There's no excuse for choosing 3G over wifi.
After more than 5 years, of using iOS, I'm tired of the substandard UI that only focuses on shallow things and doesn't deal with things like this problem where the phone should be miserly managing cell data usage. Googles android OS has a metering option that appears to prevent this very thing from happening.
This mornings overage is the final straw for me to say Goodbye to iOS on my phone. It is high time that Apple's engineering team address its customers and gets this taken care of, or I'll be moving to a Samsung/Android phone.
And when I log onto my (Windows) computer, I'm reminded of another RIDICULOUS issue of ATH.EXE using 100% of my CPU. ATH.EXE is apparently the listening service for "sync my iPhone over Wifi".
I've disabled "Sync my iPhone over wifi" numerous times, yet I'm still greeted with this issue.
So glad to find this discussion, I thought I was going crazy. I suddenly have been getting messages that I am going over my plan data usage!
I have an iPad2 with 3G that I hardly use. I usually keep the 3G turned off but lately, since I never use the 3G, I thought I would leave the 3G on for convenience when I do want to use it. Bad decision!
No problem until I started using YouTube for insomnia videos to help me get back to sleep - because it would all be on WiFi, I thought, since I was at home and ten feet from the router.
Now that I have read the posts here, I'm realizing that when the screen goes dark but the music etc keeps playing, the iPad must be switching over to 3G without me noticing. So the same must be true for my iPhone 4S. I assume I need to put it on airplane mode if I intend to use it to stream YouTube sleep aids.
Is the same thing true for using iTunes, that it will suddenly switch to 4G ?
Currently Being ModeratedMay 16, 2013 1:32 PM (in response to Pearlcinn)
Glad that worked for you. My problem with the phones seemed to be fixed with an iOS update early this year. Is your iOS up to date? If the update fixes your problem, you won't need to turn wifi on and off to manage it.
I have this same problem but mine is compounded by the 'No SIM' message. While my iPhone 4 is asleep and connected to my home Airport network, the 'No SIM Card Installed' message wakes up the display and appears on the previously blank screen every 15 minutes followed shortly thereafter by a 'Network Lost' message. After a short 'search, the cellular network is then restored and everything seems to go back to normal.
This issue arises when the phone is sitting idle or when it is connected to a docking port on an iHome clock radio.
When I check my cell phone data, these events coincide with a 10KB download of data (equivalent to a simple email check) and they occur every 15 minutes.
This introduces an additional issue since my mail settings are to 'Fetch New Data' hourly.
So, it would seem that the problem is associated with a check every 15 minutes that the cellular network is still available (leading to the 'No SIM' display) followed by restoration of the cellular network.
What I can't figure out is why it then downloads internet data over 3G when the WiFi is booming in.
Can anyone help?
Currently Being ModeratedSep 28, 2013 9:06 AM (in response to carlos m.fromnew york)
Yes, which my various iPhones have done beginning with the original iPhone in 2007 - the original was a non-3G phone but switched from wi-fi to EDGE and back again automatically.