iphone 4 working perfectly on straight talk at the moment no unlock or jailbreak with ios 7

iPhone 4 working PERFECTLY on Straight Talk at the moment.. No unlock or Jailbreak with IOS 7
location: imore.com - date: November 27, 2013
I just bought a beautiful iphone 4 16gb from a lady on craigslist. She was using it on AT&T.. I was planning on unlocking it for use on ST.. Well, I got it home cut my old ST sim card down to micro size, went to unlockit.co.nz, changed the APN settings to "New Straight Talk" and I have full MMS, 3G, EVERYING working great!!! And to top it all off its running IOS 7 just like it was on the AT&T network. I just did a IMEI search on my phone and and it came back as not under contract, but it does say sim locked.. This makes no sense to me. What would it say sim locked if I can use a ST sim? Also, would I have to worry about a future update ruining my situation? I believe the new Tracfone APN situation might have just solved a lot of headaches for iphone users.
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