Apple iPhone 4 Bumpers are a neat accessory to add the iPhone 4. They wrap around the edges of the device protecting the sides, and to a lesser extent the screen, they also add a touch of colour to Apple's monochrome phone.

Perhaps more importantly, they also shield the external antennas from your hands. And let's face it... by now there can't be many people left on earth who haven't heard about the iPhone 4 and its touch-averse antenna.

See also iPhone 4S review

Put simply, Apple made the bold (in retrospect quite foolhardy) decision to place the three antenna of the iPhone on the outside of the device. As well as being a neat stylistic touch this ensures that the signal gets direct access to the phone without being barred by a plastic or metal case.

But holding the iPhone with your left hand touching both the top and bottom antennas causes bars to disappear from the menu. So it's difficult to test the Apple iPhone 4 Bumper without putting it in the context of the iPhone 4 antenna. For iPhone 4 owners this is a must-have item, mostly because it prevents the iPhone 4 from losing its signal. You've got little real choice in the matter. The question is will you like it?

It's certainly well built. The Apple iPhone 4 Bumper is a ring of rubber and plastic that surrounds the edge of the iPhone 4. The inner part is rubber with the band running around the outside made of shiny plastic.

iPhone Bumper

A nice touch is that the plastic band also houses metallic buttons for the volume controls and sleep/wake button. Cut out holes enable you to access the mute switch, dock connector, earphones and speakers.

Attaching the Bumper is as simple as you'd imagine. You slide it around the phone. It provides a snug fit and does pretty much what you imagine it to do.

Because the Bumper doesn't cover the back of the phone, it doesn't provide the all round protection of a dedicated case. However, it does slightly raise the iPhone off the surface of whatever it is sitting on, so it will help to keep the back of the phone (now made of glass) scratch and scuff free.

Also it keeps most of the iPhone visible, which is in many ways a boon. Most cases suffer in our minds because they cover up a beautifully designed piece of kit with something usually less well designed.

Even so we're not 100 per cent enamoured with the way an iPhone looks with a Bumper attached. We're testing out the blue model here and it certainly changes the aesthetic look of the phone. It doesn't make it look cheap, exactly, but it's not quite as stylish as the metallic antenna that runs around the edge of the iPhone. The iPhone 4 looks very different with a Bumper attached, more colourful, but also less suave.