Yep, there's no number... (in Portuguese we say "dar (give) o telefone" to ask about the phone number.... i usually play: if i give you my phone you wont be able to contact me.... hehe... but thats the way we say that....)
The same way.... your sentencenis mre literal. So, what does the person want, my phone or phone number? We'll only find out when we get in the situation. Maybe someone can add aother infomration: "me dá (dá-me) seu telefone (para eu tirar um foto)?" / "me dá seu telefone (para eu te ligar depois)?"
What is the polite method between: "dà-me seu telefone?" or "me dà seu telefone?", somewhere I read that the second sentence is wrong if it doesn't begin with a noun or a pronoun.
yes, "me dá" is not considered gramatically correct, although many people say it this way. But, as in English, use just the verb in imperative is not considered so polite. you can use "você pode/poderia...?"
You could also say "Voce nao vai me dar o seu numero de telefone?". Brazilians have a tendency for brevity over completeness, especially in the spoken form of the language.
Haha, I was sure this sentence was in the voice of a robber "Hey! You! Give me your cellphone! What?! You're not going to give me your phone?! Then I have to shoot you!"
Do you really need the "not" in English or Portuguese? Are you going to give me your telephone number (or not- implied)? The answer would still be the same.