At approximately 11:45am on Monday, March 9 an unknown offender pushed a male from his bike and stole a Samsung Galaxy Ace 4.
The phone was deep purple in colour.
The incident occurred in the alleyway leading from Lincoln Road to St Clements Church Yard, skegness.
If you are able to assist police with their enquiries, call 101 quoting niche reference *12614.
Alternatively, call Crimestoppers anonymously on 0800 555 111.