Detective Chief Superintendent Simon Letchford, Territorial Policing crime lead for the Met, said:
"Many of these phones and other devices are worth hundreds of pounds and not only contain personal information but may also have photographs of sentimental value that can't easily be replaced.
"People need to take as much care of their phones in the same way as they would their other valuables. They would be reluctant for example to openly display hundreds of pounds worth of cash in the street.
"There are a number of practical steps you can take to help protect against theft of your phone and which will give us the best chance in the event of a robbery or theft of getting it back for you. I would urge all owners to take the time to carry these out."
The people in this footage are in no way connected to the crimes mentioned by the Met.
More top news
Eyewitnesses report hearing the engine on Ford's vintage aircraft spluttering before cutting out approximately 500 feet above the ground.
Police are investigating whether a Land Rover Defender found burnt out in West Horsley was involved in Tuesday night's ram raid.
The work, called Gift Horse, replaces the giant blue cockerel that previously sat on the plinth.