The men entered a Vodafone store in Newmarket, west Suffolk, where they pushed staff into a storage area and threatened a female employee.
Two of the men filled a large grey bag with £30,000 of stock then left the store.
The three were arrested after “swift and effective co-operation” between officers from Suffolk, Essex and the Metropolitan Police, which resulted in the men’s car being stopped where about 50 devices were recovered.
Samuel Zebo, 21 of Gorman Road in Woolwich, and Jevan Davis, 26, of Gilbert Road in Belvedere, admitted burglary and were each jailed for three years.
Bobby Ezeoba, 26, of Plumstead Common Road, pleaded guilty to theft and was given an 18 month community order, 250 hours of unpaid work, fined £1,000, and was disqualified from driving for eight months for having no insurance.
Detective Inspector Cat Thompson, of Suffolk police, said: “These defendants travelled to Suffolk to commit crime but were thwarted by swift and effective co-operation between ourselves and colleagues in Essex and the Met.
“Hopefully, this sentencing will send a strong message to others considering the same.”
