Found a solution. See post #7 below i have a 4s on ios 6.1.3. Noticed that cellular data was still consumed (approx 1 - 2 MB a day) even if I was on strong wifi connection. So I decided to wipe the phone (Erase all content and reset) and restored as a new phone. Did not use any previous backups from icloud or itunes - just totally brand new setup. Installed my apps and setup the phone making sure apps and settings dont use celluar data. I have gmail setup as exchange with push notifications. So last night I closed all apps except dataman pro and went to sleep. 6 hours later I wake up and according to dataman pro and settings->usage, I had consumed 300 kb in 6 hours. Wifi connection is very strong and I know the phone uses 3G went asleep, but that seems a lot to me. Datamanpro says that the apps consuming the data were push notification and sync services. I did not get a single email last night so it did/should not come from the gmail push. So my phone consumes cell data when asleep, and also when I am actively using it on wifi. 300+ kb in 6 hours may not sound like much but it adds up to about 40 - 50 MB per month just wasted on some push and sync in the background. Is this normal? What does the cell data in wifi usage go with others?