Securing access to a portable electronic device (PED), securing e-commerce transactions at an electronic device (ED) and dynamically adjusting system settings at a PED are disclosed. In an example, usage or mobility characteristics of the PED or ED (e.g., a location of the ED or PED, etc.) are compared with current parameters of the PED or ED. A determination as to whether to permit an operation (e.g., access, e-commerce transaction, etc.) at the ED or PED can be based at least in part upon a degree to which the current parameters conform with the usage or mobility characteristics. In another example, at least a current location of a PED can be used to determine which system settings to load at the PED.