A 20-year-old man suffered a head injury after three thieves dragged him out of a car and stole his phone.
Police were called to Common Road, Stafford, at around 9.50pm on November 27 following reports of an assault.
Now officers investigating the incident are appealing for any witnesses to come forward.
A Staffordshire Police spokesman said: “Did you see an assault on Common Road in Stafford last month?
“A 20-year-old man suffered a head injury after he was dragged out of his car and had his mobile phone stolen by three men at 9.50pm on November 27.
“Call police on 101, quoting incident number 744 of November 27.”