The XFINITY Mobile Visual Voicemail app allows you to listen and manage your voice messages. Your voicemail is automatically created for you, and this app allows you to view your list of voice messages. You can also play, share, delete, and if available, view transcriptions of your voice messages. Additional features include managing and recording greetings, updating contacts, messaging and calling back.

This app requires a subscription to XFINITY Mobile service and is intended for use by XFINITY Mobile customers.
From version Xfinity Mobile Voicemail 1.8.19.008:
Thanks for the feedback about login and notification issues. We focused on these for the current release. Be on the lookout for many more enhancements in the near future. As the summer comes to an end, so will voicemail issues!

What’s new:
Performance improvements to fix login issues, especially for customers who’ve recently moved.
Fixed login errors for customers with new devices.
Fixed Android O compatibility issue causing notifications to disappear.
All versions