Nonfunctional requirement in Mobile devices
How should the software perform when the network is slow? How should the software perform when the network has 5% packet loss? How about 10% or 30%? If the software requires a persistent connection, what needs to happen when the user steps into an elevator, or when the device goes to sleep, or when the application is interrupted by a phone call? The standard screen resolution for smartphones is 320x300 pixels, but tablets are larger and next-generation mobile devices can support HD screens. What should the user see in all that extra white space? We integrate with Facebook, Twitter or Google login. What do we do when that service is down, and how can we test it? Source- http://searchsoftwarequality.techtarget.com/tip/Mobile-application-requirements-Same-process-new-challenges