Lazy loding use user identity all pages?

Hello, i’m beginner and i’m doing a angular tutorial,
To see if there are a user token in cache i call this on the .ts

this.identity = this._userProvider.getIdentity();

// in html to show if there are a user

The problem is that if i use it on the app.component.ts or app.module.ts dosn’t work on the pages.

To make it work on the pages i need to call them in each page .ts

There are a way to call this functions only once and use it in all html pages(I m using lazyloding)?