Question about Nokia 105 (2019) 2G

WARNING, this is a 2G phone! The 2g doesn't work anymore in Switzerland, except at Sunrise (which will stop it at the end of the year 202021) ! I don't understand, as discussed with the Digitec salesman when I returned my phone, that it is still sold in Switzerland!

I have a micro sim and the phone works with it, however it is made for a larger sim.
In general the reception is very weak and works quite badly