Today we cannot imagine living without mobile phones. But they are popular since maybe 10-15 years and a bit earlier (even at the beginning of 1990s) not everyone had even a stationary phone at home.
How it was possible then to call for help when necessary ? Those ‘alarm boxes’ were one of solutions. They were equipped with a button, when someone pressed it, the fire brigade should come to the place immediately. At Mokotów district we already have some caches connected with remains of those facilities: https://coord.info/GC3YDRM, https://opencaching.pl/viewcache.php?wp=OP24AD.
Apparently, there are some more remains of those things in Warsaw. Some of them can hide a tiny geocache easily :)
I also remember an idea, which was a kind of continuation of those ‘alarm boxes’. In 1990s, in Bemowo district some bright yellow poles, with buttons, used for calling police, were installed in a few places, where supposedly a lot of crime were reported. They were for example next to Stare Bemowo bus station or at the intersection of Powstańców Śląskich and Radiowa street. So, all criminalists had to remember since then to do their work only near those poles, so that people could call for help easily J Honestly, those poles themselves were vandalised soon or they just simply broke down and they were disassembled a few years later. Also, mobile phones became more and more popular later on, so the idea was not important anymore.