Did sprint remove this ability from the voicemail options? If I press 5 (what used to be group lists) it says it is an invalid entry. How can I create a group list now? Also, why can I not send voicemails to visual voicemail users?
There may be something wrong with your phone. I just tested this on mine (Palm Pre) and after hitting 3 (Personal options) > 1 (Settings) > 5 (Group lists), I get "No group lists have been created. Please enter the number for the group list you want to create then..."