Antennae:

3G: If you're in an area with 3G service, the iPhone should pick up a signal without you having to do anything. Test your data connection with some basic browsing in Safari; speeds will vary depending on how good your signal/network is, but if you've got a 3G connection, you shouldn't have to wait several minutes for even complex pages to load. Try to avoid the temptation to test out the "Death Grip" phenomenon; not only does this vary from network to network, cell site to cell site, I've also found it varies from phone to phone. My first iPhone 4, purchased a little over two weeks ago, definitely exhibited signal loss in "Death Grip" mode, but my new iPhone 4 doesn't drop signal at all, no matter how I hold it.

EDGE/GPRS: Even if you have a 3G signal, there's an easy way to test if you can also pick up signal using a slower EDGE/GPRS connection if need be. Go into Settings > General > Network and set "Enable 3G" to Off. Your iPhone should fall back to EDGE/GPRS within a few seconds. Test your data connection again by browsing around in Safari, but be aware that the connection speed will be barely tolerable in EDGE and all but unusable in GPRS.

GPS: Open the Maps app and tap on the arrow icon in the lower left corner. Unless you're inside a structure with thick walls/ceilings, a blue dot should appear at or relatively near your current position almost right away. The iPhone 4's GPS antenna is both more accurate and more powerful than those in earlier iPhones -- my iPhone 3G was rarely able to find me at all unless I was outside -- so your position should show up in Maps quite quickly in most cases. If it doesn't, try again outside with a clear view to the sky; if your iPhone's GPS still can't get a fix on your location, it may be faulty.

Bluetooth: I don't have a Bluetooth headset, so the way I tested Bluetooth was by pairing it with my Mac for internet tethering. It took me many tries to get my iPhone 4 to pair with my Mac successfully, but I was finally able to do it by following this procedure:

1. On the iPhone, enable internet tethering by going to Settings > General > Network > Internet Tethering > On. You'll be asked if you want to activate Bluetooth; you do. (You can also enable Bluetooth by going to Settings > General > Bluetooth > On, but since there isn't much you can do with a Mac-iPhone pairing over Bluetooth other than internet tethering, you might as well save yourself the extra step.)

2. Open System Preferences on your Mac and open the Bluetooth preference pane. Turn your Mac's Bluetooth on, and click the checkbox next to "Discoverable" so your iPhone will be able to find your Mac. Click + to add a new Bluetooth device, and Bluetooth Assistant will open.

3. Once Bluetooth Assistant opens, your iPhone should show up in the list of devices right away. If it doesn't, this is your first indication there might be something wrong with your iPhone's Bluetooth. If the iPhone does show up, click on it and wait for Bluetooth Assistant to generate a passcode.

4. Here's the part where I got tripped up. Once Bluetooth Assistant generates a passcode for your iPhone, not only do you have to accept that passcode on the iPhone, after accepting the passcode you must immediately click "Continue" in Bluetooth Setup Assistant on your Mac, or else the pairing will fail. There's nothing in Bluetooth Setup Assistant that tells you to do this, which is very irritating -- I spent about 15 minutes cursing at my Mac until I figured this out.

5. Fortunately, once your iPhone successfully pairs with your Mac via Bluetooth, you shouldn't ever need to do it again. To use the iPhone's internet tethering over Bluetooth, click the Bluetooth icon on your Mac's menubar, select your iPhone, and then select "Connect to Network."

Wi-Fi: Fortunately, testing the iPhone's Wi-Fi is far simpler than Bluetooth. In fact, with the iPhone's default options enabled, you'll be prompted to connect to any nearby wireless networks. If the iPhone discovers a nearby network on its own, that's a good sign; if it then connects to a network successfully after you tell it to, the Wi-Fi antenna works just fine.

Touchscreen: There's two quick ways to make sure there's no dead spots on your iPhone's touchscreen. First, open any program that accepts text input (Notepad, Safari, etc.) and type "The quick brown fox jumps over the lazy dog" on the iPhone's keyboard with your iPhone in all three typing orientations: portrait, landscape with the home button on the left, and landscape with the home button on the right. This is a good test to ensure the touchscreen registers taps along most of its surface. To test swiping, open the Photo app, select any photo, zoom in on it, and swipe your finger over the whole screen; the photo should move around seamlessly with the motion of your finger.

LCD: Considering how pixel-dense the iPhone 4's Retina Display is, it's questionable if a dead pixel or two would be visible at all. You can test for dead pixels anyway using the free Flashlight app, which allows you to display many different solid and patterned colors on the screen. As for the LED backlight, it'll be obvious if it doesn't work at all, but you can test it further by going into Settings > Brightness and dragging the slider from one end of the scale to another.

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