Can I redirect a shortened Tr.im URL?

Yes, with Targets your can redirect a URL based on a user's operating system or device. First locate 'Targets for the URL you wish to redirect. 

Form the Targets page you will see a list of your Targets for the URL you have chosen. Name your Target, set your alternative link and set your Device & Country requirements. Device & Country requirements offer a dropdown menu with the option of "Is" and "Isn't". Select your preference and the corresponding device and/or country.

Prioritize your Targets by dragging and dropping each Target to it's desired place in your list.