iPhone will lock itself to the network of the first SIM card that is used in the phone. Subsequently attempting to use it on any other network, for example by replacing the SIM card, may mean it becomes permanently unusable. SIM free iPhones can only be used with a UK-network SIM card, and will not accept foreign SIM cards.
1. Subject to a fair usage policy of 3000 text messages.
2. Separate Fair Usage policies of 750MB / month apply to both BT
Openzone WiFi and Mobile Internet Browsing.
3. Unlimited on O2, fair usage policy of 750MB /month applies on Orange
and 1GB on Vodafone.