Over the past few years, OnePlus has made a name for itself by releasing powerful flagship smartphones at lower-than-expected prices. The unlocked model lets people buy their devices outright, enabling them to get a better deal on a SIM-only contract. But as the company has moved away from its invite system and faced up to the battle of fulfilling every order as soon as possible, it's also begun to expand into retail. Today, OnePlus has announced its first ever partnership with a UK mobile operator. O2 is the company in question and will begin selling the OnePlus 3 from September 29th from £28 per month.