If you want to relax, turn off your smartphone. There's a link between the number of times people check their phones for personal messages and their stress levels, according to researchers from the University of Worcester, who presented their findings at a recent meeting of the British Pyschological Society.

If you're in super-stress mode, you may have even experienced "phantom" vibrations, when you imagine your phone is buzzing but it's not. The study found they occurred in the most stressed individuals.

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Researchers administered a stress test and a survey to more than 100 participants in different fields of work. People buy smartphones in hopes of managing their time better, but they get stressed when their virtual social life becomes too demanding.

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"Organizations will not flourish if their employees are stressed, irrespective of the source of stress, so it is in their interest to encourage their employees to switch their phones off; cut the number of work emails sent out of hours, and reduce people's temptation to check their devices," said psychologist Richard Balding, who presented the findings.

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