iPhone 4 regularly using its 3G connection too much I have recently started using my iPhone near a stereo set which picks up the radio signals from calls and 3G connections, making me very aware of when the phone emits anything.

The phone currently makes about 10-20 "wakeups" per minute, which is enough to make me place it a couple of meters away so the speakers won't pick up anything. Though this is annoying in itself, I'm more concerned about if this is normal for an iPhone. I'm always connected to a WiFi router, so if it's an app trying to get Internet access – it's doing it wrong. Each wakeup lasts for about one second but sometimes (far less often) it blasts away for two or three seconds.

Is there anything I can do to find out what's causing the activity? I don't really want to uninstall my apps one by one to find the possible villain.

Edit: To clarify, I simply want to know why it's using the 3G/EDGE connection when it really should be using the WiFi.
I find that an Edge connection is much NOISIER in terms of what electronics pick up than 3g is. BTW, a low or intermittently low signal condition is liable to eat battery. When the phone tries to regain signal, it steps the antenna up to higher power. If it's doing that over and over, it can be costly to battery levels.