Using my phone in the USA

[victim31150]

Apologies up front if this is a stupid question. I have a Moto g(8) phone, which is pretty basic but it does what I need it to do. I plan to travel to the USA shortly and I've wondered how I can use my phone over there. I'll be travelling around a bit and the phone is really just for insurance in the case of breakdown. Am I correct in thinking that I could switch on 'roaming' just to make a call and then switch it off afterwards? What would be the extra cost, above my monthly payments, for doing this?

[MI5 · Accepted solution]

@victim31150 

Cost depends on your tariff.

Covered in this guide Guide: Roaming MegaGuide 

You also need 4g calling enabled to make calls in USA USA - Roaming with O2