Canada

Default data rate
$1 / day (any 24-hour period, not a calendar day). See Data and E-mail Add-ons for more information. This isn't a "smartphone" plan, but worked with an iPhone (10/2009).

Availability
Fido SIMs can be purchased in their own shops.

SIM sizes
Mini SIM's exist. Micro SIM availibility unknown.

Tethering
Unknown.