Systems and methods that regulate range of access to personal information of a mobile unit's owner. The access control component can designate granularity for access levels and/or a spectrum of access modes—(as opposed to a binary choice of full access or no access at all). Such access can be based on a spectrum and/or discrete trust relationship between the owner and user of the mobile unit. A profile definition component can exploit an owner's trust relationships to designate levels of security. The profile definition component can further define a profile based on a set of applications, such as entertainment mode, browser mode, and the like.