Hello.
I think the advice given in store might have been given out of concern for prioritising cost. Going to USA with PAYG would normally be cheaper than contract because you don't have the daily charge.
If you do however want to use larger amounts of data there, then the cost of £5 for the Passport can start to make more sense. The Data Passport (I think it's called Data Pass in the app) is usually in the same Add-on page as the Go Roam Passes. You might have to press the button near the bottom to view all of the available add-ons as they don't all show at once.
Go Roam is specifically for covering the cost that's normally incurred for using roaming services while in a Go Roam destination. The cost in USA would be £5 each day that you use an allowance, such as making a call, sending a text, or using any Data. If you only plan on using Data, and lots of it, then having a Data Passport active on the account would allow you to use Unlimited Data, and as long as the Passport is active before you use any Data, you won't be charged for the Data Passport and the Data Pass, unless you make a call or send a text.
If you're plan is to use a Data Passport each day, it would be best to stack some on the account so that they are on there and they can activate immediately each day when needed. You can't buy more than one at a time, however you can place multiple separate orders for them, so you could have 2 or 3 on there, and all you'd need to do is make sure that you always have at least one ready for the next day to start.
You'll find specifics on the Data Passport on the Data Passport Page.
Pete.
