Originally Posted by
Olly-
No, they are still separate networks even if they do have the same parent company. I don't think 3 UK has 4g roaming anywhere.
I bought this and now I'm wondering if i should top up here in the us and try it out or wait a month later, and in that case i'll be out the 20 I paid if it doesn't work.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1