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n1 writes:

The Guardian reports:

Theresa May has reportedly moved to quash an attempt by her cabinet colleague Sajid Javid to improve mobile phone coverage by warning that the plans could aid terrorists, according a leaked letter.

[...] May argues in the leaked internal Whitehall letter that Javid’s plans to end “not-spots”, by allowing customers to roam between rival networks, could aid criminals and terrorists. The Times reported that May’s objections centre around concerns that roaming would make it more difficult for the agencies to track suspects.

In the letter, extracts of which have been published in the Times, May says that national roaming “could have a detrimental impact on law enforcement, security and intelligence agency access to communications data and lawful intercept”.