Apple's curvier iPhone 3G is upon us. The 2008 model effectively ousts the original with its fast 3G connectivity, better battery life and built-in GPS.

Bar these hardware upgrades, the iPhone is much the same as the original – it's got the same 30-pin dock connector on the bottom, it boasts the same 3.5-inch multi-touch display and it runs the same 2.0 iPhone software.

Whether you ponied up £269 for an original iPhone, or you've just unboxed the new 3G version, there are a wealth of extras that you can buy to go with it. From suede flip-cases and headsets to speaker docks and software, we've gathered together our favourite iPhone add-ons below.

iPhone cases

The first thing your shiny iPhone needs is a protective case. O2 and Carphone Warehouse shops only carry a limited collection.

You'll find rubberised silicon cases (lightweight, cheap, protect from scratches) and smart leather pouches (too fiddly, hides the actual phone); Blackberry-style holsters (that clip to your belt) and neoprene armbands (designed for sports fanatics). Prices range from £7 to £20.

Search the web, however, and you'll find that there are even more. There are natty suede flip-cases and tough clear acrylic shells.

There are striking mirrored iPhone cases, invisible 'shields' and Luis Vuitton luxury sleeves. There's even a $20,000 18-carat gold iPhone case embedded with 42 diamonds.

There's really no 'best iPhone case'. It depends on what catches your eye. Want something a little different? Try a brightly illustrated vinyl GelaSkin. Or hunt around eBay for the elusive Gold Tiger iPhone Steel Skin.

Proporta headphone de-tangler

You won't know that you need one of these simple Proporta cable tidies. Not at first. Not until you've stuffed your pearly-white Apple headphones into your pocket and, when you've retrieved them sometime later, spent five minutes angrily untangling them.

The Proporta Cable Tidy is a simple solution – it's basically a magnetic clasp that can be clamped around the cable of your headphones thereby avoiding any entanglement. You can buy a pack of two online for £3.

Griffin iTrip AutoPilot

Thanks to Griffin, iPhone owners can now legally pipe their favourite music through their car stereo. The new Griffin iTrip AutoPilot is the first, fully-licensed and 'Made for iPhone' FM car transmitter. It uses Apple's 30-pin dock connector, so it's compatible with every iPod from the 4th generation onwards.