For websites, usertesting and trymyui and others are setup to do quick user testing. Are there similar services for mobile applications?
Mob4Hire is an online community of mobile device users paid to help application developers, advertisers, and content publishers with research, develop and pre-test anything mobile.
Hope this helps.
Just stumbled upon this article: http://webdesignledger.com/tools/7-useful-tools-for-mobile-website-testing
Also, this one is not really quick, but pretty nice otherwise:
UserTesting now does testing for mobile apps: http://www.usertesting.com/mobile. They send their testers a webcam to provide an overhead view of their device. The disadvantage is that the device has to be flat on a table, or close to it, so you might not see users interact with their devices in quite the same way as they might in real life.
Here's a Nielsen Norman Group article (2013) about mobile testing techniques if you want to do these studies on your own without a service like UserTesting: http://www.nngroup.com/articles/mobile-usability-testing/.