The present invention provides a system and method for modifying a profile of a user device prior to sending the profile to a destination server, wherein the destination server customizes content provided to the user device based on the modified profile. In general, the profile of the user device may include information identifying capabilities of the user device, user preferences, and demographic information regarding a user of the user device. At either the user device or a mediating server interconnecting the user device and the destination server, the profile of the user device is modified based upon one or more rules to provide the modified profile. The modified profile is then provided to the destination server, which customizes content provided to the user device based on the modified profile.