After updating my 4s to ios6, I'm having the same problems with wi-fi switching to cellular on it's own and running up my data usage.....anyone else having this problem?

After updating my 4s to ios6, I'm having the same problems with wi-fi switching to cellular on it's own and running up my data usage.....anyone else having this problem?

The iPhone is DESIGNED to switch to cellular data when asleep, unless it's connected to a power source, in which case it will stay logged onto the WiFi network.  iPhones have ALWAYS behaved this way.
Either turn cellular data off at night, or leave your phone connected to a power source to continue the WiFI.

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