Thank you for your message.
I've checked with our developers on this just in case if there are any updates on the ETA for the address book for mobile Viewer.
Unfortunately, we still cannot provide any approximate ETA for it. Of course, we will do our best to provide this feature, and the improved mobile Viewer app in general, as soon as we can, but currently our biggest priority is Host/Agent for Mac/Linux. I apologize for the inconvenience.
Please let us know if you have other questions.