IPHONE 3G IOS 4.2.1 AFTER RESTORING ITS SHOWS NO SERVICE?

My iphone goes blank while I restored through ITUNE to its factory default. Then I tried many time to restore with my previous backup taken through.last, I used redsn0w and install cydia. Now NO SERVICE is appeared. I can't make a call or receive a call. After googling, I downloaded ultrasn0w deb file and using ifunbox, i manually put the file into varoot\media\cydia\autoinstall dir and restart the iphone. I notice that ultrasn0w is lying with light red colour in cydia - manage-package and green right click is not there as others.ie it is not installed. Please advise how to activate my cellular data and Wi-Fi. I have try out more than 10-20 times by googling.

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