IPhone 3g no SIM card installed problem?

Ok, so i found my moms old iPhone 3g and was going to use it for music, games, etc. I have no intention on making calls or texting. So without knowing about resetting phones, I hit the the "Erase all Content and Settings" button, thinking that it would erase all apps and personal info. I just wanted to get it to factory reset so that it would be like new. Now the iPhone shows a "No SIM card installed" icon. Followed by a message saying "Insert a valid SIM with no PIN lock to activate iPhone". I tried to slide the unlock bar to unlock it and it brings me to a dial pad that will only allow me to call "Emergency" numbers. All I want to do is get to the home screen so that I can use this iPhone for music.

If there's anyone out there that could help me with this little dilemma, I would greatly appreciate it.

P.S. I'm not looking to buy a new SIM card or get service on this iPhone.

Reinstall it

Just go to your carrier and ask for an unactivated SIM card… They'll probably give you one for free.

Or borrow one from a friend or family member. You only need it to activate, not use the device.

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