Hailo, which operates in the UK, Ireland and Spain, announced in July its merger with mytaxi, which operates in Spain and six other continental European countries.
The combined entity, with 70 million passengers and 100,000 drivers across 50 cities, will be known as mytaxi, and will be led by Hailo CEO Andrew Pinnington, with mytaxi founder Niclaus Hewes taking a seat on the board. It will be headquartered in Hamburg.
A statement from the company said: "Following the news that Hailo is joining forces with mytaxi to create Europe’s number one taxi app, we’re pleased to announce that Teneo Blue Rubicon has been appointed to lead on public affairs and PR strategy in the UK.
"Its first assignment will be playing a crucial role in the launch of the mytaxi brand in the UK."
The agency started working with Hailo last month.
The organisations have some history of working together - in 2012 Hailo took on Surname & Surname, a now-folded offshoot of Blue Rubicon, to handle its consumer PR.
Blue Rubicon has since been reorganised as Teneo Blue Rubicon following its acquisition by US group Teneo last year. Since that announcement, it has won a string of major clients including Diageo, Kingfisher and Halfords (see related stories tab below).