Small, single-purpose tools that answer one question accurately. Each reads state directly from the device rather than inferring it, works without an account, and functions offline — a diagnostic that needed a working connection to explain a broken connection would be no use at all.

Between them these utilities have been installed more than 200,000 times. That device population is where most of what we know about Android telephony comes from: the same documented API returning different values on different manufacturer builds, states the documentation never describes, and readings that are confidently wrong on particular handsets.

The questions they answer are ones the operating system knows the answer to but never surfaces. Whether Voice over LTE is genuinely supported by your handset, provisioned by your carrier, and currently registered — three separate conditions that all have to hold before a call can connect, and which no phone shows you. Whether the 5G indicator in your status bar reflects an active standalone connection or a carrier display preference. Whether a problem is your device, your plan, or simply where you are standing.

Neither app can change any of it. They report, accurately, and let you stop guessing — which for most people is the thing that was actually missing.