4s 64 GB Excessive 3G Data Usage while logged into Wifi net

Do you have Wi-Fi sync enabled in iTunes? How about your iCloud settings; are you backing everything up to iCloud?

Wi-Fi sync would have nothing to do with cellular data usage.

Check Settings > Store > Use Cellular Data... is it On or Off?

There should also be a similar setting under Settings > iCloud.

Settings/iCloud/Documents and Data/OFF.

I think it's an iCloud issue, so turn everything off except Find My iPhone (and if you have a MobileMe account, then just remove iCloud entirely). You can use other e-mail accounts to sync what iCloud does (except Find my iPhone and Documents and Data)

What about that usage is excessive? Based on the numbers provided, the device is using a little under 21mb/day or about 630mb/month. That's not excessive. It's certainly not 20-30mb per night as originally stated.

3mb/hour could easily be legitimate data usage.

Based on the postings here... I'm not really certain that I understand what the issue is.

If Cellular Data is turned off, all data usage stops, correct?

If Wi-Fi is turned on and connect, Cellular Data is on, and the device is connected to external power, all data usage stops, correct?

If this is not legitimate data usage, it could be an email "stuck" trying to send constantly, it could be iTunes Match (but I'm skeptical of that), it could be a rogue app.

Does the docking station that the device is being placed into provided external power? Does it actually show the device charging when in this docking station? Keep in mind, that even with Wi-Fi turned on and connected, if the device is not connected to external power, the Wi-Fi antenna shuts down when the device goes to sleep.

Turning mobile data off manually totally when in docking station and connected to WiFi stopped the data usage - but isn't really a good fix.

Here's a recent mobile data usage pattern (data from mobile provider):

20.02.2012	19:55:41	0 MB
		(1 KB)
20.02.2012	20:55:41	1 MB
		(1.036 KB)
20.02.2012	21:55:41	3 MB
		(3.020 KB)
20.02.2012	22:55:41	3 MB
		(3.233 KB)
20.02.2012	23:55:41	3 MB
		(3.250 KB)
21.02.2012	00:55:41	3 MB
		(3.079 KB)
21.02.2012	01:55:41	3 MB
		(3.233 KB)
21.02.2012	02:55:41	3 MB
		(3.084 KB)
21.02.2012	03:55:41	3 MB
		(3.138 KB)
21.02.2012	04:55:41	3 MB
		(3.147 KB)
21.02.2012	05:55:41	3 MB
		(3.277 KB)
21.02.2012	06:55:41	2 MB
		(2.110 KB)
21.02.2012	07:55:41	0 MB
		(33 KB)

A fix is a fix. If it works for you, then just use it.

I also thought it would be a lot more as well. That seems pretty normal. Your iPhone is ALWAYS connected to a data network, unless you (the user) specifiy say so otherwise (with Wi-Fi, Airplane mode, etc.). This isn't really any different with other smartphones, either.

My Mom is having the same issue on her iphone 4 which we just updated to iOS 6 - i monitored the cellular usage and in the course of one hour there was 16mb of data being sent - and this was having the phone sitting there doing nothing!

She is a 200mb plan with ATT so this has caused us some overages - she never had this happen prior to iOS6.

I've modified some settings and will continue to monitor this - but something is very odd here - just don't know what the solution is.

Ill add to this to say I saw that my mom had 6 email messages in hour outbox that were unsent - I have a feeling these messages with photos were continually trying to be sent but could not be - due to some confusion on an @me.com or @icloud.com set up issue that occurred after we upgraded her iphone.

I'll keep monitoring the usage and see what happens.

I have an i Phone 4S using i OS6. Via Telstra in Australia

Used 1.5 gb of data last Sunday!! Crazy

Wasn't connected to any Wi Fi at the time either.

Complained to Telstra and they are going to waive excess data charges

Complained to Apple on the phone, they are aware of the problems and their Engineers are working on a fix.

In the meantime I was advised to turn off Cellular data when not needning it.

I am on Day 5 of my AT&T billing cycle.

I have spent the last 3 days in Mexico in Airplane mode. So that's 3 our of 5 days without using cellular data. I am now up to 355MB of data transfered though for the day today since my return and I have been on my home WiFi. I'm at a loss to understand how that can be when that was my usage for a month all these years!

In 4 years of iPhone I've never had to worry about my data usage before now. With iOS 6 I've had to reset my network settings, disable anything but essential apps from using data, disabled iCloud, and the list goes on, all this while checking my data usage daily and taking pictures of usage every day. That's just not the way it should be.

This is the second month in a row that I have had to add extra data bolt on to my tariff because of this.... :@

I am seriously considering selling or trading the iPhone if apple don't sort it out promptly...

Here's mine for a few days. Everything on phone set to wifi only. I'm not doing the cloud or music match. Usually the phone is plugged in charging and on my wifi network. A couple of times it was in my pocket and I could feel the phone getting really hot. One weird thing is I reset my usage statistics a few days ago. The ATT site says I've sent about 700mb in that time while my phone says I've only sent 11.2mb. I usually use 200mb\month. I'm up to 4g this month.