IPhone 4s with ios 6 shows full wifi signal but can't access to the internet while other idevice can

Hi everyone,
I updated my iphone 4s to ios 6 a few months ago and there was no problem until I change my sim card to other carriers last two days. This second sim card is the same sim card that I used it earlier this year with no problem. But the problem I face is when my iphone goes to sleep mode I realised that I can't receive any push notification from imessage, Whatsapp, and Line. When the phone is awake the wifi signal is back and I have to go to each application in order to get the message. I have tried the following methods but it didn't work: reset all network settings, restore as new iphone, push home and power button together, switch off my iphone, turn on airplane mode, and even change my router. At the moment I have restored my iphone as new for the 5th times.
Now the problem is worsen, after the phone is sleep for about 5 minutes and when I awake my iphone it shows the wifi signal. But I can't access to the internet at all. It shows no working internet on Whatsapp. Safari can't load any web page, the weather app can't update temperature etc. I have to switch off and switch on wifi in setting menu so that I can use the internet. And when I leave my iphone four about 5 - 10 minuetes then the problem start again. While I can't access to the internet on my iphone 4s, I used my dad's iphone 4s with ios 5.0.1 and it works just fine with the internet. My laptop can also access to the internet with the same wifi network but not my iphone.
Does anybody know what's going on with my iphone 4s? Is it the bug from IOS 6 or my iphone is broken? Please help me.
Thank you.

Any update will cause problems for a few users. And those users will rush here and post "the sky is falling" stories about their experience. The 99.99% of people who have no problems after an update won't bother to post here; indeed, most of them don't even know ASC exists. FWIW, I had no problems with iOS 7 on my 4S. Your problem is most likely not related to iOS 6, but you should probably update anyway. For addressing the battery issue see this outstanding article: http://www.overthought.org/blog/2014/the-ultimate-guide-to-solving-ios-battery-d rain

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