After uninstalling RoboKiller voicemail not working

Uninstalling the app is not enough. You need to fully deactivate their invasive service.

See https://support.robokiller.com/hc/en-us/articles/360027065591-How-to-disable-call-forwarding-to-Robokiller

Larry Fees wrote:

After uninstalling RoboKiller voicemail broken

<Voicemail not working.log>

Start by contacting your phone carrier, voicemail is their feature.