I'm really surprised no one has mentioned this tweet that Tachain posted on the 31st October: https://twitter.com/tachain6/status/1057662367931289600

They are confirming that there is a partnership in place with OnePlus, one of the biggest tech companies in the world. It's not clear on what lines the partnership is. I imagine they will be an advertising partner that will publish ads on the Tachain adnet and will be displayed on transportal app.