Libby101a wrote:
Also go to iCloud.com/find and mark your device as lost.
See these articles: If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support
Step 7 of that article mentions removing the missing device from your Apple ID account.
OP: Be aware that if you do this, it will clear any Activation Lock that you have set, and the thieves, or their fences or customers, will be able to reset your phone and use it as yours. So you might not want to carry out that step.
Also beware of "phishing" messages claiming to be from "Apple Support" about your lost phone. Apple Support is not the sender of such messages. The senders are invariably criminals whose goal is to scam you into unbricking the phone, providing the credentials they need to get into it and make it "theirs", or otherwise rip you off.