Before revision:  Using model parameters tailored to describe SARS-CoV-2 diffusion, we show thateven when the probability for a contact to be traced is the same, manual contact tracing robustly performs better than the digital protocol in increasing the epidemic threshold, limiting the height of the epidemic peaks and reducing the number of isolated individuals. This remains true even taking into account the intrinsic delay and limited scalability of the manual procedure.
After revision:  Using model parameters tailored to describe SARS-CoV-2 diffusion, we show thateven when the probability for a contact to be traced is the same, manual contact tracing robustly performs better than the digital protocol , also taking into account the intrinsic delay and limited scalability of the manual procedure.