Cellular devices and networks have come a long way, from brick phones and Blackberrys to iPhones and Google Pixels. In addition to being the ubiquitous connectivity protocol that keeps the Internet at our fingertips at all times, LTE is appearing in IoT products across all industries.

When we’re testing our apps, it's a big headache to simulate what the user goes through while steering clear of the more problematic parts of those processes. These parts, often external and beyond our control and responsibility, are usually not the focus of our testing. Think external services, third-party modules, or APIs. Relying on these unpredictable elements for our tests is a no-go. Nor do we want to rework our tests to check internal implementations just to dodge these issues.