I have successfully "hactivated", "JB" and "Just Boot" iphone 3gs ios 6.1.6 baseband 6.15 through redsn0w. I upgraded entire Cydia, installed p0sixpwn and ultrasn0w, but I was facing "no service" or network "searching" issue. I installed SAM and got stuck with the activation, it is saying "SIM NOT VALID". I tried to connect iphone 3gs with itunes and got the same result.
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