international call

Tmobile does have stateside international plans of you're interested but I think it's only for landlines in Japan.

https://www.t-mobile.com/coverage/international-calling?cmpid=MGPO_PB_P_EVGRNPSTPD_43700070661169790_652852541995&gclid=Cj0KCQjwnrmlBhDHARIsADJ5b_ltaFinPJbOhTpniEdbPJIUUo3dUZDCd5te9sKo6Iff2sqU6pdZidoaAlpZEALw_wcB&gclsrc=aw.ds