After a short use of new google fi sim with a galaxy s8+

1 there is no icon for wifi calling available anymore
2 apparently when I get a call it rings both on my phone and hangouts (PC) at the same time (a little confusing but I've only received one call so far and I answered on hangouts not realizing I could have answered on my phone since they were next to each other)
3 no ability to set different ringtones for different numbers
4 voicemail - I have to call to retrieve messages BUT I cannot seem to be able to see a list of messages (typed) / CORRECTION I meant previous voicemails-
I don't know if I could access messages from hangouts if I am overseas to avoid a call charge

Still on a learning curve but it is interesting that a non google fi phone has a LOT of limitations that their phones don't have - AFAICT - no ability to see list of message phone numbers nor does the message identify the caller (as both sprint and tmo did from my contacts)
No ability to use their spam blocker

OTOH the calls have been clear so far....... well back to learning more
ADDED - voicemails are NOT identified by caller number or name
apparently I cannot imput my contacts into hangouts even tho they show up when I start typing the name and they are all on google contacts
FRUSTRATED BY OVER 1-2 HOUR WAITS TO TALK TO SUPPORT, NO ANSWER TO EMAILS FOR OVER A WEEK, INABILITY TO SEE CREDIT FOR PROMOTION (altho a 9 cent credit appeared from google voice ), but not the $200 credit promised)