My iphone 4 can't find a network

I bought my iphone 4 in Ny and brought to Brazil. It was working fine till last Friday. It can't find a network anymore. It says on the upper left corner "no service" instead of showing the carrier name and its signal. I tried to contact my carrier but it seems to be everything fine, I even tried de microchip on my Ipad and it worked perfectly, so it should be a proclem with the phone.
I tried to reset the device, but nothing seems to work.
Anyone could help me on this, please!!!
(excuse my lousy english, please!)

1. Try doing a hard reset:
Press and hold both the Home button and the Sleep/wake button simultaneously for about 15 seconds and release when the Apple logo appears.
2. If that doesn't work, use this article for troubleshooting: http://support.apple.com/kb/ts1398
3. If that doesn't solve the issue, backup the device and restore it as new.
In that case, use: http://support.apple.com/kb/HT4137
NB: set up as a NEW device because a software issue will be in the backup. If the issue persists after restoring as new, you should offer the device for service.
If you get specific error messages/codes in iTunes when updating/restoring, check this: http://support.apple.com/kb/ts3694 for causes and solutions
If you restore your iPhone to factory settings without a backup and still can't detect/connect to any network, you should offer the device for service.
Good luck
JW

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