Make 911 calls with a Iphone that does not have service?

With the old phones from the 90s and stuff you could still dial 911 even if the phone was not active. Is this true for iPhones? If I disconnect my iphone could I still use it to make a 911 call?

I'm not sure but I know you can without a sim card

Yes the iphone has an emergency call feature, as long as there's battery and signal you can use it.

Yes. All cell phones, even those deactivated, are capable of being used to contact the Emergency Medical Services (EMS). This is a Federal Communications Commission requirement. As long as the cell phone works (even if it does not show any reception (aka bars), it may be used to call for help in an emergency.

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