Carrier $45 Unlimited Talk, Text, Data on Straight Talk (AT&T MVNO)?

has tried using straight talk iphone? reading around looks use at&t's postpaid network. read work at&t locked phone, including at&t locked iphone, because supposedly at&t mvno. can confirm this?

http://www.straighttalksim.com/

 

search forum. i've heard of people doing i've never tried personally.

 

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