Here's a friendly reminder just in case you don't know. If you're a Three customer who has purchased a handset from Three since 2014 then your phone will already be unlocked, but those of you know purchased before won't have been so lucky. Thankfully though, Three have a system that allows older phones that are still looked to be granted their freedom without paying a penny. All you have to do is head to the Device Unlock page on the Three website and fill in your details. One such piece of information that you will need is the IMEI number. To get that, dial *#06# and note down what comes up on screen. Thanks to Zoomster @ HUKD for the reminder!