OnePlus has launched a hilarious but useful campaign in London. Called Warp Charge SOS, folks living in the city with a low cell phone battery have been asked to tweet at OnePlus UK using the hashtag #WarpChargeSOS with your location and a “rescue team” will come to charge your phone where you are. You can also post on their official Facebook account using the hashtag.

The rescue team will arrive in a fire truck with a large battery pack with multiple USB ports and proceed to “rescue” your phone.

Warp Charge SOS is a one-day event in London. After today, it will head to Amsterdam and Utrecht on October 5 and Helsinki on October 9.

Oh! And you don’t have to be a OnePlus user to enjoy the service, OnePlus says “all citizens are equal”. We only wish OnePlus made another power bank.

Warp Charge is OnePlus’ fast charging technology. There is Warp Charge 30 which charges at 30W (6V 5A) and there is the new and faster Warp Charge 30T which also charges at 30W but at 5V 6A and is 23% faster than Warp Charge 30.

Warp Charge 30 is available on the OnePlus 6T McLaren Edition and OnePlus 7 Pro while Warp Charge 30T is available on the OnePlus 7T.