What is a "feature phone" anyway? It is, as I've learned, a "normal cellphone", i.e. not a smartphone. One of those "old" phones 80% of worldwide mobile phones users (including myself) rely on. It turns out these old phones can be crashed quite easily by a malicious SMS through "special binary characters and overflowed headers" according to this article.
The process is aided by the network carrier repeating the sending operation when this fails, and by a special shutdown watchdog which is built in in some older Nokia phones, which shuts down the phone after receiving three malformed SMSes in a row.
What's not so bad in all this, is that the effects are only temporary, as the phone will work fine after restarting.
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