Here is their new call rates. It lists the incoming rate for each country. Right below the charged inbound countries, it also mentioned that call rates are charged per minute. I believe I read otherwise in the other thread.
http://www.freeglobalsim.com/freeInbound.asp
Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile