How to implement data exchange at a distance between devices?

Question

Iron

It is necessary to design two devices between which data can be exchanged at any distance. The limiting factor is the size of the device, it should be very small 10x10mm is desirable. I thought about GSM connection, but I did not find anything concrete.

Answer 1

Telepathy or quantum bonding, catch a couple of photons, entangle them, change the first, read from the second. But seriously, what does any mean? This does not happen in nature at the current level of technology development. If you need this, then either you do not understand how communication works in modern devices, or you have not correctly formulated the problem that you are trying to solve. GSM Shield, just like GPRS, etc. exist, but your limitations are definitely not included with the entire harness. This size allows maximum WiFi on ESP, but even it will be approximately 1.5x2.0

Answer 2

Why so small? Lost fast!
And it stands like a continent of the planet Earth!

Answer 3

Do we have a science fiction forum?