One day, a new island appears in the middle of Earth's ocean, inhabited with humans who have lived there all their lives (but in another dimension). The island is not visible to anyone outside a 25 mile radius, so the rest of the world has no idea the island is even there.
Apart from the existence of the island, we can assume the rest of the world is just like the modern day.
The islanders know about Earth's laws and policies - let's say an encyclopedia washed up on their shores. They want to make first contact with the rest of the world, but without violating international law.
They face a few challenges:
- All boats in international waters need an MMSI code to be able to make radio contact with another ship. The MMSI number is derived from a MID, which is issued by the ITU. However since the ITU is not aware of the new island, it hasn't assigned them any MID.
- Similarly with phone networks - they can neither call nor be called because they don't have an international country code, because one has not been assigned by the ITU. Neither do they have any means of connecting with phone networks, for similar reasons.
- Their currency has basically no value, because it cannot be converted into other ("hard") currencies. Even if they could make contact with a foreign exchange, no one would want to buy their currency because they wouldn't be able to sell it again and no one would be able to spend it (this could be alleviated over time with tourism and exports, but foreign relations must be established first)
- Because their currency has no value and they have no access to hard currencies, they are not able to do things like sign up for a satellite Internet account
How do they legally make contact with the outside world and start to establish foreign relations?