The head of the National Infrastructure Commission has called for urgent action to tackle poor mobile phone coverage.
Lord Adonis has written to the telecoms regulator Ofcom urging it to take action to deal with the issue.
It follows a report that one million homes have poor broadband and large parts of the UK have no 4G coverage.
It is not the first time Lord Adonis has criticised the state of the UK's mobile and broadband services.
In October he launched a public consultation on the quality of the state of UK infrastructure generally, but singled out mobile services as an area needing urgent attention.
Now, in his letter, Lord Adonis says that Ofcom and the government need to "put all options on the table" to tackle coverage black spots. These should include possible legal and regulatory changes, he said.
The chairman of the National Infrastructure Commission said that it was a concern that four out of five rural homes did not have any 4G service indoors.
"In an age when access to a mobile signal is regarded as a must-have, it is deplorable that even in areas previously considered to have strong coverage, operators are still delivering such poor services that customers can struggle to make a quick phone call," he said.
"It demonstrates the need for urgent and radical action to tackle this issue immediately, ahead of new mobile spectrum being auctioned and 5G technology being rolled out," he said.
The former Labour transport secretary said significantly higher signal strengths were required to improve customer service and mobile phone companies should share masts where appropriate.
The government minister overseeing the sector agreed that industry must do more.
Matt Hancock, minister for digital, said there was a "clear need" for rapid improvements to mobile coverage.
"We've recently removed outdated restrictions, giving mobile operators more freedom to improve their networks including hard-to-reach rural areas," he said.
"But industry needs to play its part too through continued investment and improvement in their networks, making sure that customers are not paying for services they don't receive."
Ofcom said it agreed that mobile coverage should urgently improve and it was setting new rules for operators' licences.
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