TIL: you can have as many as 8 (eight!) eSIM cards added to your iPhone. Found out because I wanted to get local esim for internet and it just let me without deleting any of my simcards. Also - I can use dual-sim with two esims!
@maotsu@social.lol@pawel Same here 
Dual SIM is super useful. I use my eSIM from Orange with my main number on a daily basis, and I use the slot when I'm traveling to and when I buy a local SIM card.