Question about Samsung Portable SSD T3

The charging cable of the Samsung Galaxy S6 edge should fit.

I can't answer the question because I don't have a smartphone. If it's the same as the Samsung Tablet S2, it's a micro USB port on the tablet side and a USB 3.0 port on the SSD side. Sorry, it's complicated, but it's probably in the interest of the manufacturers to produce such a tangled mess. The customer doesn't really play a role. You will probably come across a manufacturer who produces this combination.
jk