Crystal balls can be used like a mobile phone but most prefer not to do this as it is too close to human technology for comfort. Eileen has used her crystal ball for this but most use these to conjure up images of those they want to contact (and generally stick to friends). Eileen has communicated with the Witch via crystal ball but given faces tend to look a bit distorted, it really isn't a pretty sight no matter whom you conjure up. And conjuring up the Witch like that takes nerves of steel so that pretty much means only Eileen would dare do it.
The Palace has a kind of mini post-office as the correspondence received there is catagorized into Urgent, Important, Nice Letters from Kids and Old Ladies, Complaints and Probably a Nutter but Ought to Check Out Their Claims Just on the Off Chance There Is Any Truth in Them. Hanastrew and the fairy squad tend to get asked to investigate the latter. To date they have been able to confirm the writers have all been of the lunatic fringe variety.
The ironic thing is that there are trolls in the Fairy Kingdom but they don't indulge in what we know as trolling!