The retailer described the move as the "next step in its transformation" as it joins its UK mobile operations with the wider business.
In a statement, it said the move was due to the change in how customers buy their mobile devices, connectivity, and technology.
After the standalone stores are closed on 3 April, the company will focus on selling mobile devices and connectivity through its shops in 305 Currys PCWorld stores and online.
It is expected that 40 percent of employees will be able to get new roles within the company but more than 2,900 will be collecting their P45s and pink slips.
Dixons Carphone said it would "go well beyond legal obligations in financial and other support for all affected colleagues".
Group chief executive Alex Baldock said: "Today's tough decision is an essential part of that, the next step in making our UK mobile business a success for customers, colleagues and other shareholders.”