how to reset iphone without connnection

Hey there takk11,

Thanks for reaching out to Apple Support Communities. We understand you’d like to know how to sign out of your iPhone when it has no internet connection. We’ll be happy to help with this.

Check out the steps under “If you no longer have your iPhone, iPad, or iPod touch“ from this article for ways to do what you want:

What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch

Also, if you can’t restart your iPhone, try a force restart with the steps here:

Force restart iPhone

Also, what kind of connection issues are you having? Will your iPhone not connect to Wi-Fi? If so, try the steps here:

If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network

For cellular issues, try the steps here:

If you see No Service or Searching on your iPhone or iPad

Take care.