If I'm understanding you properly, you have purchased an iPhone and taken it to a country that doesn't have iPhones currently but which was unlocked in some fashion and so was functional with your local service's SIM card. If this correct then unfortunately what you've done is take an illegal (to Apple's thinking) but functional unit and upgraded to a legal but non-functional unit. At this point you have a couple choices.
1) If you are a Mac user you can download the Dev Team's jailbreak/unlock software and it will allow you to unlock and activate your iPhone again with the non-AT&T SIM.
2) Find someone willing to do this for you.
Without unlocking your iPhone you have a very nice but expensive paperweight.
Next time someone gives you advice to do something to your iPhone that you don't fully understand I'd tell them to play with their own units. That's why I never jailbreak or unlock friend's phones. If I screw up I'm responsible for them not having a functional phone anymore.
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