I Tested 9 UK VoIP Mobile Apps for Notification Reliability. Only 3 Passed.

From my experience the single most common complaint about business VoIP, across every UK provider I have worked with, is: "the mobile app does not ring reliably." So I set up a controlled test last month. 9 providers, 200 calls to each, same hardware, same network conditions. The methodology Two test phones: iPhone 15 Pro (iOS 17.4) and Samsung Galaxy S24 (Android 14). Both on the same 5 GHz WiFi, both with notifications enabled and battery optimisation off. Each provider's app was installed, lo