bab2010 said:Wifi use data; 3G use data, Edge/GPRS use data. When your phone is connected to wifi, it's using a wifi data, if you are not connected to wifi, then you will be on 3G which is using your 3G data. The type of network you are connected to will be display on the status bar so you can know if you are on 3G or if you are on wifi. In some rare cases, you will be on wifi and your phone will still be using your 3G data (Cases like you were on the go and then have your VPN turned ON, then when you arrive at home, your iPhone found the wifi and connect to it but couldn't arrive to turn off the VPN, in this case where the VPN is still on, it's on over 3G and all data you will exchange will be made on the 3G while you will be thinking that you are on wifi because you will see the wifi sign in the status bar of your phone. So if you use VPN while on the go, make sure that when your phone find and connect to wifi, it auto turn off the VPN, if not then turn off the VPN manually.) Other than that, there is no worries about your 3G data when you are on wifi.
I said that there are some very rare cases where even though you are connected to your wifi all your streaming will be going on over your 3G. I gave one of those rare cases example there. I'm talking from experience and with 100 of iPhones, not from experience with 1 iPhone. But again there is no worries about those rare cases it happens really really rarely and only on defective iPhones, iPhones like those which cut off the wifi connection over a period of time of not using the phone (even though the wifi signal is still showing up in the status bar, you will not be able to browse internet or do a thing related to internet and only was to solve it is to restart the iPhone) These are some of the defective iPhones which can pretend to be on wifi where by they are using your 3G in fact.Wifi does NOT USE DATA from your cell phone plan at all.
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4s_mtl said:Yes Data is used even if on wifi.
I am with Bell and it seems that my wifi is not providing answers fast enough for the iphone 4s. This visible especially in AppStore. When on wifi (and 3G active in bgd) the updates in app are faster than wifi only. So every time I get home I turn off 3G.
Data is used when it's connected to wifi however it will not affect the monthly data allowance.
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philinpdx said:How cold data be used w/o it affecting the monthly data allowance? I thought usage = tracking data allowance = less minutes or extra charges?