Abstract: Mobile devices executing applications utilize data services worldwide. Many failures or adverse user experiences of these applications have been determined to be the result of network issues. Testing of the applications for networking issues is facilitated by utilizing a test network having proxy devices placed at different physical locations. A tester may use the test network to direct traffic to and from an application under test to one of the proxy devices. Using the proxy device, the traffic is then exchanged with a real-world network, such as a cellular data network, at the different location. The tester may thus test operation of the application under test in real-world conditions at a variety of different physical locations. The results may be used to mitigate or eliminate the failures or adverse user experiences. Additional testing may also be performed on the application after deployment to end users.