I will be in the States for 3 days next month and plan on visiting an Apple store to check out and purchase one of the three new SIM-free iPhones I’m heading to Europe for 2 weeks for vacation and was thinking of using T-Mobile for the for the entire trip (US/Europe). Once again using my Claro SIM when I get back home. This presents some questions: Can I use my non-US SIM during activation? If I have to use my US SIM (T-Mobile) for activation will I have issues using my Claro SIM when I get home? Any suggestions for avoiding issues with having my phone end up becoming “Carrier Locked”?