Hello _highimalli7_,
We see that you have some questions about your iPhone. Yes, if your iPhone is completely dead, all calls will go right to voicemail. People can still send you messages and they will be there once your phone has charged and powered back on.
As far as sharing your location, we are not completely sure what you mean. Are you not able to share your location? Or your friends cannot share their location with you?
This page has some information that might be helpful for what you're experiencing.
Find people and share your location with Find My - Apple Support
Take care.