This article is complete rubbish. Everything was tightly measured and controlled. The radiation levels required to trigger memory bits (ferrite memory!) in a building next to the train station, through the walls and metal panels enclosing computer blocks and at such a distance, would probably make a cow glow in the dark :) Geiger counters weren’t restricted - they just weren’t sold to the general public. But somehow, after Chernobyl, every one of my friends managed to procure one (I had three). Even the final part about "filling in immigration papers with any country" is implausible. It wasn’t possible to simply emigrate from the Soviet Union to any country. There was a limited Jewish emigration path, but it was far from easy.
https://en.wikipedia.org/wiki/Sequential_probability_ratio_t...
https://global.honda/content/dam/site/global-en/topics-new/c...
This does not seems plausible. I live in urban area but do not have good cellural connection at home and my mobile phones are usually route calls via home Wifi. All SMS come through. It is just a low-lever transport and I doubt it cares about message size or numbers.