The Google Fi program is strictly for Americans to use in the U.S with limited travel outside the U.S.. It must be activated while in the U.S. and the account will be cancelled if Google detects that you are usinging it regularly outside the U.S. To the best of my knowledge it's not publicly known how they determine this but it's thought to be related to the charges the phone incurs for using foreign cellular services so I try to avoid using foreign cell services as much as possible. I have Google Fi turned off most of the time and use the phone mostly with my wifi. I turn it on when I need to make calls or when I'm receiving a sms. There is a slot for an esim which can also be used. I try to keep my travelling and Arg cell phone usage below 150mb per month.Will it work to use a USA number in Argentina for Argentinian matters, or is it necessary to have an Argentinian phone number? Will Argentinians be charged long distance to call me?
Google Fi is interesting and so are the Pixel phones. Yesterday I noticed a deal they are having where you can get the Pixel 4a for $217 and this is paying only $9 a month for the phone for 2 years, so you're not even paying it all at once. Pixel 4a is already a good price and now this is much better. You have to sign up for Google Fi though. I signed up yesterday because I like the Pixel phones, 4a is well reviewed phone. Also, I don't expect to have much data usage since I'll move my music files into the phone rather than stream it, has 128 GB storage, so maybe I'll save on monthly phone bill as well. Also, there are multiple carriers so I'm hoping I'll get better reception than my current provider. And if I visit Argentina that'll be an additional advantage. I have the Pixel 1 phone and am very satisfied. It's got various features like call screening which is very useful, and there is a new hold feature where the AI will let you know when you're on hold that someone has picked up on the other side. Also gets good updates compared to other Android phones, for 3 years I think.
My Pixel 3A usually connects quickly to the nearest/strong cell tower. I don't think I've ever failed to get a connection or had a disconnection. I'm sure you'll be hapoy with the 4A