Could Not Activate iPhone 3GS in Colombia

Hello.

I bought my iPhone 3GS in a Store in Bogotá Colombia, wich where imported and Activated on EEUU.

When iTunes offer to me to install the last Version of iOS 5.0.1, my iPhone could not be activated because the activation server is temporarly unavailable.

Then I connect my iPhone to iTunes Version 10.5.0.142 to activate it, and try... and try... and try so many times durning 3 days!, and nothing happens.

I Try install the firmware using the redsn0w, with versions 5.0.1, and nothing, after with versions 4.2.3, and the iOS was incompatible, making the iPhone not start and stay blocked in the iOS icon of the Apple.

Finally the most far that I came was this error messaje:

"There's no SIM Installed on My iPhone that I trying to activate. But It's false. I have installed an Tigo SIM Card, activated with 400 minutes of conversation, 3G and 1 GB of internet communication working".

I try Register the cellphone putting that I'm EEUU, with no GPS, and Nothing

I try Register the cellphone putting that I'm Colombia, with no GPS, and Nothing

I test my SIM card with other cellphones and works perfectly.

HELP PLEASE!!!

If I can't solve this problem, I'm affraid that I'm going to sell this cellphone and buy an Android.