Voicemail

★★★★★ Great tool for professional telephony. The continuous reconnecting is a disadvantage.

★★★★★ Works OK, easy to use, but messages can appear days late.

★★★★★ Slick UI, easy to use, has been stable so far.

★★★★★ I wrote to complain that I was receiving notifications only of calls with a recorded message, and they changed my settings so that I get notification of all calls including the ones without a message. Since then everything is perfect.

★★☆☆☆ Why do I need to allow phone calls and SMS if I only want to set up the voicemail of my landline?! I'm not even at Telecom with my mobile number! It "fails to log in" when I deny those permissions (didn't even ask me for credentials) and I won't give them access to make phone calls, see my call history, read and send SMS! (not enough space to add this in German)

★★☆☆☆ The apps permission list is gigantic. Telecom basically starts provisioning your device by installing the app which is unfounded for. Why can't you simply be a reliable and best German cell provider instead of my new cloud service provider and enterprise manament provider that I never asked for. The privileges are hidden by Google's sick joke where you have to tap All Permissions. CrowdStrike's Falcon Sandbox analysis of this app unhampered from Google Play Store was concerning — understatement