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4S foreign SIM card abroad or roaming in US (international roaming on foreign account) unlocked
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I saw this video on youtube here:
http://www.youtube.com/watch?v=7x5_B8EkhLE
Again this will NOT work with native +1 US native phone number SIM cards from AT&T or T-Mobile due to competition reasons from VZW & Sprint. If you know computer programming you can change that using the usual methods found on Google.
VZW:
http://www.youtube.com/watch?v=KPDv8S-Izrg
So if you have a foriegn SIM card with international roaming enabled IT WILL WORK TO TEST IN THE US roaming on AT&T or T-mobile!