I'm going to have a short trip in US, and my only cell phone from 7-Eleven doesn't work in US.
I'm thinking to buy a cheap prepaid phone with $10 of airtime when I arrive, use it lightly while I'm there (mainly to be reachable by family back home), and hopefully have it unlocked when after I come back.
I read that T-Mobile will unlock a headset after 90 days of service.
I found walmart.com has a prepaid Samsum with T-Mobile service for $15.
Are those prepaid phones from Walmart (and the like) activated, or can they be activated at the store? I would like to be reachable soon after I leave airport.
Do you have experience regarding unlocking such phones from US?