Official T-Mobile Connect Prepaid Discussion

Having a little trouble locating information amongst all the press releases and promo material on Google. Can anyone help or point me in the right direction?

Just signed on to T-Mobile with the $40 prepaid plan. (Needed to get eSIM.) No international data roaming on T-Mob pre-paid; I knew that and I'm cool with it. But my understanding is that calls and texts are possible ... just chargeable at the normal international roaming rates.

If I were to change to the $15 Connect plan, does that stay the same? I've seen snippets about "no international roaming" and "no international roaming benefits" on that plan, but what isn't entirely clear is whether that means "no international data" or "no calls & text either".  (In other words, does it mean you don't get the international roaming benefits that a post-paid account would get? Or does it mean you don't get any at all?)

Related:  when abroad, with wifi calling and wifi texting work like normal on this Connect plan? 

For the most part, I don't need the roaming; I've got a good plan with a UK carrier, so mostly when abroad I use T-Mob for wifi calling and wifi texting, which treats me as domestic. But I would like to know that my SIM is connected to a cell tower when abroad just for backup when I need it. It always was back in the good old days of the $3 pay-as-you-go plan, even if the call and text rates were ... well ... not entirely inexpensive.