Where do I send my Sharp mobile phone for warranty support?  It is a
GX-32 bought from an overseas vendor, and not supported by Sharp-USA.

Tough to say without knowing which country you bought from. You can
look online at the Sharp worldwide site for mobile phones:

http://sharp-world.com/products/mobile/index.html

Then click on the GX link, and choose the relevant country in the new
window that pops up. From the link in that country, you can find the
address for the warranty claim and repair.