FHM will kick off an adventure-themed contest on July 1 and Heat will start a fashion-themed one soon after.
Each title will have monthly winners, who will finally go head-to-head on a final brief to compete for the prize of K800i and K810i cameraphones.
Sony Ericsson has created a dedicated microsite for the competition and has also done a deal with portal Yahoo! to promote the site. The competition will culminate with a London gallery exhibition of the winning images.
The concept was created between Mediaedge:cia and Sony Ericsson's creative agencies Brando and Iris.
Mediaedge:cia then went on to broker the deal with Emap2, Emap's creative advertising services arm.
John Harber, managing director of Sony Ericsson in the UK and Ireland, said: "The Search will pitch people of all photographic abilities against each other. It is exciting to know that Sony Ericsson will be uncovering some of the UK's freshest and most creative photographic talent in this multi-faceted campaign."