A small Kickstarter-funded startup called Rabbit got attention with a similar concept recently, but they are a minnow compared to Deutsche Telekom.
I suspect AI will eventually come to be the predominant OS of all our computing in all our devices. To displace apps, all that is necessary is AIs trained to operate each one. After that, presumably new protocols will enable AI to interact with services and tasks. That's not all people use smartphones for though. How will they get AI to scroll through social media?
There are a lot of incumbents like Google & Facebook relying on us to stay doing things the old way. News like this from Deutsche Telekom must make them nervous.