O2’s DOOH campaign launches innovative code-breaking competition only for the tech-savvy (Pioneering OOH)

Last week O2 ran an innovative code-breaking competition only for the tech-savvy. Customers had four days to crack a code hidden within an O2 poster to claim a free OnePlus 3 The tricky formula was displayed on a O2 billboard opposite the Ace Hotel in London’s Shoreditch. The first person to crack the code every day won a brand new OnePlus 3. […]