Ceci est mon téléphone.
English: This is my phone.
Demonstratives point to people or things by distance and number. In French, ce/cette/ces are used.
Use demonstratives to identify items in context, often with être.
Ceci est mon téléphone.
English: This is my phone.
Cela est notre bus.
English: That is our bus.
Ce sont mes clés.
English: These are my keys.
Ce sont vos chaussures.
English: Those are your shoes.