Three, EE owner BT, and O2 have confirmed they are talking to the government, although few details are available.
Three told BI: "We are committed to helping fight the spread of the coronavirus and are in discussions with government on how best we can assist."
O2 told Business Insider it was engaged in helping the government, but said it would not identify or map out individuals.
BT told The Guardian: "In relation to the use of mobile data, we are still actively exploring possibilities. As always, we are mindful of the privacy of our customers, while making sure we do everything that might help the medical authorities in the fight against coronavirus."