Q: Difficulties to Enable iPhone 5

You are not addressing Apple here and it is not a good idea to post your email address on a public forum.

It sounds like the device is locked to a carrier that you are not using. What is the exact error message that you receive when you did the restore?

for No Sim Card:

try another Sim card or try your simcard on other iPhone. if it works in other iphone that means it is a HW issue.

for Sim w/ PIN:

put your sim card on other phone(any phone) then remove your sim pin. otherwise, lock you self out and call your Carrier and ask for a PUK code to activate the simcard.

You can also try this support document for other methods of troubleshooting SIM card issues. http://support.apple.com/kb/TS4148