If getting no service...Do not install ultrasnow...its not required...
3 options you bought a busted iphone with damaged, hopefully not...
Reset network settings from phone...
Or do a Complete restore ( this option requires you to read as you need to first download tiny umbrella
http://thefirmwareumbrella.blogspot.com/ and save shsh files...hopefully there is something 4.3.3 or less, if you do have a shsh for anything under 4.3.3 then start server with tiny umbrella
Now download which ever firmeware under 4.3.3 that tiny umbrella has saved for your iphone
http://www.iclarified.com/entry/index.php?enid=750
Now download a program call Snowbreeze
http://ih8sn0w.com/index.php/welcome.snow
You will need to use snowbreeze to make a custom firmware file so you can restore with itunes...
After snowbreeze makes custom firmware put iphone in pwned dfu according to instructions with snowbreeze
Open itunes and hold shift and click restore, find custom firmware you just created and restore with itunes.
This is the only way to restore firmware on iphones with 6.15 So please follow all steps exactly
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