mobile-phone/cellphone number
Dame tu numero de telefono means give me your telephone number
Cual es tu numero de telefono in English literally translates to "What is your number of phone?" Which really means "What's your phone number?"
My phone number is...
"Tell me your phone number."
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
041739136 9062
Assuming you mean 'telephone number': Eso es mi numero de telefono
This means "My telephone number is..."
Este es mi numero de telefono
gustavo nevarez leon
el numero de telefono de mi madre