Choose and activate your iPhone 4

Which Band? Be Sure With a Quadband World GSM iPhone 4

Not just any GSM phone will do the trick. There are four GSM bands used around the world: 850, 900, 1,800, and 1,900MHz.

North America uses the 850MHz and 1,900MHz bands. In contrast, Europe, uses the 900MHz and 1,800MHz bands.

In order to have a phone that will work in the most countries possible, you must ensure that your handset is Quadband (GSM 850/900/ 1,800/1,900MHz).

Cutting Things Down to Size - SIM to MicroSIM

The iPhone 4 factory unlocked uses a MicroSIM, and a normal SIM card won't fit into the phone's SIM slot. You will have to cut your SIM card down to MicroSIM size. This is quite easily done, using a SIM cutter, which is inexpensive and available through online stores. Do not use scissors!

Micro SIM Adapters allow a MicroSIM card to be used in handsets that use a full size SIM, so you don't need to own two SIMs.

Activating Your iPhone 4

Factory unlocked iPhones are very cool. They will activate with ANY SIM from ANY carrier of ANY country. In technical terms, You can use this device with a SIM card from any 2G GSM 850 / 900 / 1800 / 1900 and / OR 3G HSDPA 850 / 900 / 1900 / 2100 network worldwide.

To activate the phone: Download the latest version of iTunes (set up a iTunes store account if you don't have one); connect your iPhone to your PC or Mac's USB port, using the dock-connecter-to-USB cable supplied. Open iTunes, and your factory unlocked iPhone 4 should simply pause and iTunes will say "Your phone has been unlocked". And away you go. Voila.