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It sounds that you probably have a nerve irritation that is causing a limited muscle fasciculation . These occur time to time and feel as you describe a phone buzzing. What happens is that a small nerve branch that controls a muscle has a sequence of rapid firing and the muscle twitches in a rapid burst. It is very common to occur of the eyelids for example . Some people may experience scattered fasciculation of multpile muscle groups ...
This issue is generally harmless and transient. If an ongoing problem or broader type symptoms then check with your doctor.
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Anthony Bray MD