IPhone 4S uses 3G data even with WiFi network available

I've been trying to figure out why the iPhone still uses 3G data even when it has a WiFi network available. It's usually just a few MBs per day, and as such - I attributed to niotifications, location services, etc.
But today, I got a really nasty surprise...
As I woke up, my iPhone showed the WiFi indicator as usual, but internet was slow... as if it was using cellular data. Something i quickly confirmed by trying to access stuff on my internal LAN and not being able to.
Worst of all, my iPhone went through over 600MB of cellular data overnight - that's my entire data limit for a month! - meaning I'll have to pay for neary 400MB of excess data usage paid at overly inflated prices (I'll be paying nearly 3x my monthly bill just for the excess data!!!)
As if all the bugs I've been facing weren't enough: Invalid SIM, showing full strength 3G signal when it's actually "offline"... Now I have to face stupidly wasted mobile data when I'm at home within WiFi range?
I've been an iPhone use for years, and have upgraded every year to the new models... but this iPhone 4S has been my worst experience ever with a mobile device, and ruined all the trust I had in Apple devices...
I sincerely don't know what to do next... if I'll still wait for a 5.1 update that may/may not fix all the issues I (and thousands others, as seen by the discussions here) have been having... or if I cut my losses and try my luck elsewhere...
Tired of serving as a guinea pig and doing all this debug work for Apple...

The WiFi data is recorded separately - and the mobile data use was verified using the operator "reporting" service (and later sending me the warning SMS of the data use).
The iPhone was in the home screen, locked, and "sleeping" when the data was used, so the only option would be the iCloud backup - which, in any case, should never ever use the 3G data (and never has until today).
If the WiFi was not working, then it should either: not have internet access; not show the WiFi connected signal in the status bar. As it was, it was showing WiFi access, but using the mobile data just the same.
Which, from what I understand, could have "tricked" iCloud into doing its regular backup thinking it was over WiFi... but in reality doing it over cellular data.

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