Hi caorafam --
In an effort to improve the Touchscreen Controller's response time, the following apps were removed as of February 2, 2016: XFINITY Voice, News, Sports, Word of the Day, Calculator, Sudoku.
We have other options to access your XFINITY Voicemail. The following article details these different options: http://customer.xfinity.com/help-and-support/phone/get-voicemail-while-traveling/
Please let me know if you have any further concerns.