@giosal

Sunrise has had 5G SA since last year. SA is slower than NSA, as they haven't activated Carrier Aggregation on it, so you're always connected to only one frequency, whereas 4G+5G NSA can go up to 5 frequencies on Sunrise network. however, with 5G SA you get VoNR as well as lower latencies and network slicing and a lot of other benefits too

I'm using it too, but the eNB/gNB only correspond in Sunrise network, with 35/535 being GE, 20/520 - VD etc. in Swisscom and Salt, the antenna IDs provided by Confederation do not correspond to the eNB/gNB on the network itself, so it's quite difficult to estimate the correspondence between those. I also know of LTE Discovery, as well as Open signal, but so far, Cellmapper is the best for me

fyi, I would be happy to help in any way, I am a web developer and recently started dabbling in app development as well, don't hesitate to contact me I. case I can help