ERPhone now has a brand new SMS app that features a modern style messenger.
There are two lists that contain all players and players you recently had a conversation with. The latter also has a column that displays the number of unread messages.
A new arrow button right next to the search bar can collapse the interface to free up some space for chatting.

Level app
This app displays information about what each level unlocks in addition to the usual level bar information.
The green colored label indicates your current level.