In Spanish, it means just what you've written (though 'dr' should be 'de')
Translating it into ENGLISH, on the other hand, it means:
'What is 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?"
Dame tu numero de telefono means give me your telephone number
Assuming you mean 'telephone number': Eso es mi numero de telefono
My phone number is...
"Tell me your phone number."
Tienes telefono? me das tu numero? Do you have a telephone? may I have your phone number?.
mobile-phone/cellphone number
"Numero" in Spanish translates to "number" in English.
Mi=my, teléfono=telephone, and es=is. so my telephone is...
its writen as: cual es tu numero. it means what is your number
It means: What is your phone number?
'I (have) lost my telephone number. Can you lend me yours?'