Trion has released and iOS app for Rift. Some of the things you can do with it are:
Chat with friends and guildmates
Full guild support with guild and officer chat
Guild MOTD and Guild Wall
Zone Event notification
Earn in-game loot
The best thing about the app is that it is free. So if you have an iOS device and are still playing Rift then I would say this app is a must have. An active Rift game account is required to use the app.