If you have a smartphone and a telescope, you can use your phone as a finder on your telescope. There are apps available that will help you do this, and they work by using the GPS capabilities of your phone to pinpoint the location of astronomical objects in the sky. Once you have found an object with the app, you can then use your telescope to look at it more closely.
This can be a great way to learn about astronomy, and it can also be useful if you want to take pictures of astronomical objects through your telescope. Just keep in mind that because smartphones are not designed for use with telescopes, there may be some alignment issues when using this method.