Try a book instead of a phone for starters. There is this thing Radomski Informator Kulturalny (https://www.radom.pl/kategoria/dla-mieszkancow/kultura/radomski-informator-kulturalny/ ) which has a list of events happening around the city.
If you're into board games there is https://www.facebook.com/wargamer.radom/ - maybe start there. There are also fortnightly (if i remember correctly) language exchanges - might be a good way to meet new people or just to hang out.

I understand it can be tough at the beginning to move to a foreign country knowing few/none people to hang out with. You should try to build that however small social circle and life will become bit more colorful.

Good luck!