First off let me say this is "NOT" a master tutorial on how to make a pretty shiny mount, I needed a mount to hold my phone to video capture other instructables that I'm working on. Why not use my digital camera, short simple answer is my android phone has a direct to to YouTube feature that makes for quick uploads. A simple and quick helping hand!
Step 1: Materials and Tools
A couple of peices of wood (wider and thicker than your phone)
Nut (one that fits your tripod bolt)
(Keep in mind that any alternate hand tools can do the same job)
Forstner Bit (larger than the nut)
Drill bit (slightly larger than the tripod bolt)
Drill with countersink and driver bits
Router or saw
As for cost mostly it was just scraps laying around, however if you had to purchase the materials it would probably be a couple of dollars.
Step 2: Trace and Clamp
Trace your phone and clamp it to you work space
Step 3: Use a Router and Make the Cut
Alternatively you could cut and use 2 thin strips of wood and sandwich them between the two larger pieces instead of using a router.
Step 4: Drill and Attach
Tip: Forstner Bit is a nice addition if you have one however a larger drill bit would do the same job on this particular project.