Mobile phone coverage expanded southwards on the Northern line

Following the latest expansion of coverage on the Underground, more of the bottom of the Northern line is getting mobile phone coverage in the tunnels.
The expansion of mobile coverage on the southern end of the Northern line includes the tunnelled section between Clapham North and Balham, as well as within Oval, Clapham Common and Clapham South stations.
In addition, coverage on the Bakerloo line recently went live along the tunnelled sections between Piccadilly Circus and Embankment, with furt