My neighbor who she and I are really good friends, they went to Japan last year... and they had a shock when they got back with their phone bill.. it was was like almost 500.00 bucks, more than the normal bill... she was freaking out... I think that they had T-Mobile at the time... Apparently her DH misunderstood how the international calling worked with the plan they currently had at the time... 2 phones, 2 iPad and 1 laptop... it added up quickly...
I like my Verizon and I like that fact whatever your plan is it stays the same when traveling internationally...
double check and recheck... to make sure that you don't get a unwanted surprise when you get home....
On another note...
What is your thought process on going to Japan in June... have you set a decision date yet to decide if you are going or not?
Wow. That would be an awful bill. I'll have to be careful for sure!
Right now would be the time I'd be finalizing a few things: Ghibli tix, making sure some meds were going to be legal to bring in without prior approval, making sure I was contacting my card companies or at least making a checklist, maybe getting a new piece of luggage etc.
Instead right now I'm just waiting for Delta to add June to its dates that can be cancelled with the extended e-credits available. I really don't think June is going to be a low-risk time to fly (including quarantines in Japan as a risk.) So I think the trip is going to be cancelled. So I'm not doing any of my other pre-trip planning.
Instead I'm just waiting for Delta to extend dates. Our flight leaves in June, and our normal credit time is up in early July (like about July 2nd), so without special help from them I can't even reschedule for later in the summer such as August. I really need that 2 year extension, I think. Or a refund.
I know they are busy with people changing the April and May flights.
So hopefully soon....
Or, things could suddenly start looking good for June, in which case we're going to Japan as planned!
But I'm not counting on it.

DD didn't get into the special school, which might make it somewhat easier to reschedule in the holidays or even skip a few days, though she can't skip much in HS anyhow. I'd love to reschedule for Christmas despite crowds. Just give me a crystal ball. And the Delta extension.
Editing to add that I didn't set a decision date. Delta has gradually extended its dates, so my thoughts are they will add June soon. I'm trying to be very patient.