PhoneBook includes the following features :

  • group creation/modification/deletion
  • nested groups
  • smart groups
  • group emoji icon (using SYEmojiPopover, see iOS Libs)
  • adding multiple persons at once in a group
  • texting a group
  • mailing a group

It is not on the App Store but you can discover it bellow. If you want to obtain the sources or some insights feel free to ask!