Use AirDrop between iPhone and older Macs (need "Don't see who you're looking for?" button on Mac)
There are two versions of AirDrop. The Mac-to-Mac AirDrop that was introduced in Lion works with old Bluetooth modules. The Mac-to-iDevice AirDrop that was introduced in Yosemite only works with newer modules (2012 or later). If you really want to get Mac-to-iDevice AirDrop, you'll need to either upgrade your AirPort card or get a dongle. Continuity Activation Tool is a great app for enabling that feature, and they made a handy chart telling you what hardware you need to put on your computer to make it work with Mac-to-iDevice AirDrop.