Symptoms
- Voice sounds synthetic or tinny
- Effect is worse on Wi-Fi Calling or VoLTE than regular calls
- Sound improves on speakerphone
- Both callers notice the robotic quality
Likely causes
- CommonWeak VoLTE or HD Voice signalThese features use lower bandwidth in poor signal areas, which can create an artificial-sounding compressed voice.
- CommonBluetooth codec limitationsSome Bluetooth headsets use lower-quality call codecs that sound robotic under weak connections.
- PossibleNetwork congestion compressing call audio furtherCarriers may compress voice data more heavily during high traffic periods.
- PossibleWi-Fi Calling over an unstable networkA shaky Wi-Fi connection can distort VoIP-based call audio.
- Less commonOutdated phone software affecting audio codecsBugs in older software versions have occasionally caused audio processing artifacts.
What to do
- Move to an area with stronger signal, since weak VoLTE connections often sound robotic.
- Turn off Wi-Fi Calling and test over standard cellular, or vice versa, to compare quality.
- Disconnect any Bluetooth headset and test using the phone's built-in speaker and mic.
- Restart the phone to refresh its network connection.
- Check for a software update, since some audio codec bugs are fixed in updates.
- Ask the other caller if the robotic sound is on their end or yours specifically.
- Try the same call over a messaging app like FaceTime or WhatsApp to compare against regular cellular calls.
- If the issue is consistent regardless of connection type, contact your carrier to check network settings.
When to call a pro
If robotic-sounding calls persist across connection types and locations, contact your carrier to check network or VoLTE settings.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.