If you're planning to purchase an iPhone4 on Vodafone, you'll need a new Micro SIM which is smaller than the standard GSM SIM you're probably using now.

Q.How do I get a Micro SIM?
• A:It's easy, when you purchase an iPhone 4 on Vodafone, we'll give you one for FREE.
Q.Can I keep my existing number with a Micro SIM?
• A:
  • Yes - if you are an existing Vodafone customer purchasing your iPhone 4 in a Vodafone Retail Store , we can swap your existing mobile number onto your new Micro SIM immediately for FREE.
  • If you are new to Vodafone, you do not need to do anything. You will receive a Micro SIM with your iPhone 4.
Q.What happens when you swap to a Micro SIM?
• A:Once you swap your mobile number onto your new Micro SIM, your standard SIM will be deactivated, so you won’t be able to use it again. Make sure you have your iPhone 4 and your new Micro SIM before you request your mobile number to be transferred.
  
  REMEMBER, to back up your contacts from your current SIM card. You can do this by:
  • Connecting to iTunes if you are already an iPhone user
  • Visiting any Vodafone store once you have your Micro SIM – we can copy your contacts from your old SIM to your Micro SIM.
Q.How do I update my iPhone4 with FaceTime?
• A:1.Install Latest version of iTunes (Version 10.2.1) from http://www.apple.com/itunes/download/ or if you have iTunes already installed you can select Help > Check for updates in iTunes
  2.Connect your device to your computer
  3.Select your iphone when it comes under devices section
  4.Select Summary Tab.
  5.Click on “Check for Updates”
  6.You will be notified about the new version iOS 4.3 available for your device. Select update to update your device.
  7.After selecting update you will be asked if you want to backup your device data. Select yes if you want to backup your data.
  Note: Do NOT unplug the device while updating the software.
Q.How do I activate Face Time after updating to iOS 4.3?
• A:Go to Settings > Phone > toggle the Face Time switch to turn it on.
Q.Will Face Time be turned off if I power off my Iphone4?
• A:No, Face Time will be turned off automatically only when you update or restore your iphone. After updating/ restoring the device you will be prompted again if you want to activate Face Time.
Q.How long does it take to activate Face Time?
• A:Depending on Network congestion it can take from 5 minutes to 1 hour.
Q.How much do I get charged for Face Time activation?
• A:An SMS will be sent from your phone for the activation; however this SMS is free of charge.
Q.Does FaceTime work on 3G and WiFi?
• A:FaceTime only works on WiFi networks.