Usa

[George1954]

If I use my mobile data in the USA is it the same usage as using in the UK.

 Thanks 

[Cleoriff · Accepted solution]

No, you will be paying for O2 Travel at £6.00 per day, unless you are eligible for O2 Travel Inclusive.

All info in this great guide @George1954 

Guide: Roaming MegaGuide 

Also data usage is very slow in the US. You may be better using a local sim from AT&T mobile.