Dependant upon the charm, and the spirit's purview how certain charms offer communication. Prayers, Prayer Tranceivers, varied transportation (Portal) abilities, varied communication spells, though the dream speaking charm only has the same plane requirement. The distance can even be overcome by essence expenditure. Yes, a bit more costly, as in the Dragonblooded charm for communication, you can multiply the distance by a magnitude (multiple of 10) for additional essence, the more you pump in, the farther you can send your message. For 12 motes, a dragonblooded can send a message from the Archipelago to Lookshy.