mobile-phone/cellphone number
"Cual es tu numero de telefono" in Spanish translates to "What is your phone number" in English.
"Tell me your phone number."
My phone number is...
cual es tu numero de telefono = what is your phone number cual es el numero de telefono = what is the phone number
my telephone number is
Assuming you mean 'telephone number': Eso es mi numero de telefono
Este es mi numero de telefono
This means "My telephone number is..."
gustavo nevarez leon
el numero de telefono de mi madre
What is your cell pnone number