O2 customers can gain free access to the Call of Duty: Black Ops 3 multiplayer beta by downloading the O2 Priority mobile app.
To grab your code, head to the Entertainment section of the app and select the option to “Get access to Call of Duty: Black Ops III Beta’. Once selected, click ‘Use it now’ and you’ll be able to redeem your code on the Call of Duty website.
Codes appear to have run out at the time of writing, although a post on HotUKDeals claims that new batches are made available on a daily basis.
If you aren’t on O2, the only other way to guarantee access to the beta is by pre-ordering the game.
Black Ops 3’s multiplayer beta begins next Wednesday, August 19 on PS4 and August 26 on Xbox One and PC. The full game, meanwhile, is due to launch on Friday, November 6.
Source: priority.o2.co.uk