I purchased a USA SIM in Taipei and used in the USA last year. Here’s my information and Report. It works great and was on as soon as I landed in the USA.
It worked out better for me than buying a SIM card in the USA which I have done before but tends to be more complicated and can get expensive. This SIM card is basically a flat rate, can extend online with credit card, is usable immediately upon arriving in USA and is simple to pick up in Taipei even with basic ID.