It will not work as it is only licensed to use o2's frequency range in the uk so in the usa it would be operating on another providers frequencies on 2100mhz 3g.
As such would break usa fcc rules.
You could get a 30 day sim only consumer tariff and put that sim in to your phone with tugo and divert all calls from business number to consumer number and the divert will be free and receiving calls over wifi will also be free and up to the allowance on the sim for outgoing. as sms are free to receive you can continue to use the business sim to receive sms.
But the main push should be for all business customers to push for tugo on business .
take the £150 cost for a boost box and compare to £11 a month on 30 day sim only cheapest tariff and cancel with 30 days notice if you only need it a few times a year and get a new one each trip.
Just my take.
And maybe last post for a while
iPhone 11 Pro 256gb on unlimited data
iPad Pro 12.9” 2020 256gb refresh o2 family discount
Apple Watch series 4
My first mobile was in 1995 a CM-R111 from sony on Cellnet.
Wincanton South Somerset (Full 4g 3G 2g indoor coverage) Remember we are all customers here not customer services