Hello, we have not long ago paid for an iphone 4 as well as we am starting to be starting to Turkey for open break… we was wondering how we could clear my iphone 4 with a ultimate chronicle to accept a Turkish SIM card.
If it helps during all, a dual SIMS are:
SİM TURBO
and
GEVEY SİM
Thank You 
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There can be many ways to Unlock your phone. As far as i know unlocking by codes is the simple and safe way. I will suggest the website Unlock-Zone.com which is doing good service and they were recommended highly in the cell phone forums.
I used them to unlock my cell phone. contacted them and within 30 mins i had my unlock code and my phone was unlocked.
Hope this helps.
you can unlock it with this easy-to-use and trusted unlock service.
http://www.tiny9.com/u/jailbreak-unlock8752
it works fine with the latest version of iphone4.
Gevey Turbo Sim is ok, easy to fix.
i get my GEVEY SİM here:
http://www.4coolday.com/iphone-4-unlock-gevey-turbo-sim-p-226.html