A man was sentenced to 10 years in jail last month following a National Mobile Phone Crime Unit (NMPCU) investigation of robberies in London last year.
In May and June 2007, two violent robberies occurred in the West Hampstead area, where lone females were followed from the local station and then robbed as they neared their houses.
Mobile phones were stolen and one victim had her cheekbone broken.
Nathan Benjamin, aged 20, was arrested six months later and was found in possession of two other stolen phones, taken in two more violent robberies on lone females who were both sexually assaulted.
Benjamin appeared in court but then failed to appear for sentencing. NMPCU officers traced one of the stolen mobile numbers to an address where Benjamin was eventually found. He was charged with false imprisonment, sexual assault and two counts of robbery.