My unlocked iphone 4s doesnot work in every country I travel to. It needs a Turbo Sim in some countries for it to work! Why? and what's the problem?

I got my unlocked iphone 4s from Apple store. It works in most of the countries I travel to, but in some it keeps showing a 'Searching' signal! I had to buy a turbo sim for it to work! Is the problem from my 4s or the sim? an why this is happening?

To my best knowledge turbo sim does not hack a phone. I have not used it to unlock the phone, i have already bought it unlocked. Am pretty sure its not an issue with my iphone, I have been using it normally all around the countires I have been to, till i faced the mentioned problem in one country and they fixed it by using a turbo sim. Now that I have left the country, am back to using my 4s without the turbo sim and it's working perfectly fine.
Thanx anyway...

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