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
Three security staff at a Vauxhall nightclub have been cleared of manslaughter after a man they restrained passed out and later died
A family is homeless after a fire in their tumble dryer. The family had been in touch with the manufacturer after a recall notice went out.
The crew's union Unite said the airline was "joining the 21st century" following a two-year row over the issue.