A woman was robbed of her phone while walking near to Fratton station.
The victim was walking along Claremont Road in Fratton just before 9pm on Wednesday when a man snatched her Huawei PRO mobile phone and ran off.
The woman suffered a minor hand injury during the robbery.
She described the man as Asian, about 5ft 8ins tall, aged between 18 and 24 years and of slim to medium build.
He had short black hair and a green puffa-style jacket.
Police have asked anyone who saw a man matching this description to call them on 101 quoting crime reference number 4419034342.