Google Fi is $20/month for voice and text, plus a variable $10/month per GB up to 6GB where it caps out at $80/month.
Note that I'm not arguing against you, just wanted to clarify that the t mobile experience is just as seamless as Fi, in case I overcomplicated it.
T-Mobile even supports WiFi calling in the same way as Fi, if you want to enable it (handy for me at work, where I'm in a building built like a bunker that gets close to no reception on any network).
I guess we have different standards here in Europe.
If you can actually get these plans using Apple SIM - it’d be order of magnitude cheaper.
Trying to figure out how to get a prepaid plan with a good amount of data that'll work everywhere in Europe isn't easy. Then there's issues about recharging the plan, and many of them don't accept foreign CCs, so you need to be in the country you purchased it in to buy a voucher from the carrier's store.
I also hadn't found any 'unlimited' data options on a prepaid SIM - they only appear to be on the more expensive contract plans. At least, based on my searches in France, Netherlands, Denmark and Norway.
Most of the prepaid SIMs I saw had heavy restrictions on tethering - can you point me in the right direction?