It is not, it is related to both major phone service providers in my country. Abroad, everything worked just fine. And just in 4G/5G, however 3G is getting phased out, so if I forced it, I was often unreachable.
I was wondering if I could fix it myself, but I'm not even sure if this is firmware or OS issue. I assume the former, which afaik is not opensource? Not sure.
You should know the trade-offs of different algorithms, though. Many libraries let you choose the implementation for a spcific problem. For instance tree vs. hash map where you trade memory for speed.
Doesn't seem a universal bug.
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