https://community.three.co.uk/t5/Network/USA/m-p/16053#M2610 <P>The 3 sim should logon to 3's preferred network but sometimes it is necessary to manually select a network and I don't think it matters which network you select. If 3 does not have an agreement with that network the I don't expect your phone will work.</P><P>If you are going for more than a few days you may be better off with a local sim and you can buy these from Amazon UK.</P> Thu, 03 Aug 2023 20:51:10 GMT sc1999 2023-08-03T20:51:10Z https://community.three.co.uk/t5/Network/USA/m-p/16052#M2609 <P>Which network do Three UK phones roam onto when in the USA ?</P> Thu, 03 Aug 2023 20:43:52 GMT https://community.three.co.uk/t5/Network/USA/m-p/16052#M2609 Anonymous 2023-08-03T20:43:52Z https://community.three.co.uk/t5/Network/USA/m-p/16053#M2610 <P>The 3 sim should logon to 3's preferred network but sometimes it is necessary to manually select a network and I don't think it matters which network you select. If 3 does not have an agreement with that network the I don't expect your phone will work.</P><P>If you are going for more than a few days you may be better off with a local sim and you can buy these from Amazon UK.</P> Thu, 03 Aug 2023 20:51:10 GMT https://community.three.co.uk/t5/Network/USA/m-p/16053#M2610 sc1999 2023-08-03T20:51:10Z