How to fix push notifications in my Iphone 3Gs?

I recently updated my iphone into IOS 6.0.1 and i discovered that push notifications are not working except Text Messages Notifications.
I have tried many methods but i couldn't fix it.many people prefer SAM but SAM doesn't work on IOS 6 no more. I have tried PUSHFIX and PUSH DOCTOR but nothing helped.
please tell me how can i fix this problem is there any easiest or hardest way to do it?

Added (1). Sorry But I already checked those settings they are on>> whatsapp notifications are on.
but i can't receive them…

To turn the notifications on, first install an app that supports them.
Next, tap the Settings icon, which is on your iPhone homescreen unless you re-arranged it.
In Settings, a Notifications menu will be near the top (if you don't see it, you likely don't have an app that supports them). Move the slider to "On."
Turning notifications on will reveal the apps on your device that support push notifications. Choose the ones for which you want to turn on and off notifications. Some apps may have multiple types of events that can trigger notifications.

You have three choices for notifications: onscreen alert, sound, or badge (a number icon added to an app icon, a la the Mail app showing how many new messages you have).

When you're done with these settings, you're done enabling iPhone push notifications.

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