Deal is back on! I've just bought a lime version, pink is also available.
As with all O2 Refresh deals, pay off the phone contract immediately, get O2 to unlock the handset then cancel the airtime contract.
Upfront cost = £9.99
Phone contract = 24months * £5 = £120
Absolute steal for a phone with such good specs e.g.:
Display = 720 x 1280 pixels, 4.3 inches (~342 ppi pixel density)
CPU Qualcomm Snapdragon 800 Quad-core 2.2 GHz Krait 400
microSD slot, up to 64 GB
20.7 MP camera
2300 mAh battery
OS: Android OS, v4.4.4 (KitKat), planned upgrade to v5.0 (Lollipop)
IP58 certified - dust proof and water resistant over 1 meter and 30 minutes