Suppose you work in a office and there is a guy there who you know for a year and you he asks you to call him so that he could find his missing phone through hearing the phone vibrating or something. The point however is, you don't have him as a contact on your phone and you want to say that in a kind of funny way, you don't have his number like below:
- why I don't have your phone number?
- why I am not having your phone number?
- why am I not having your phone number?
- why don't I have your phone number"?
Would please tell me if those are idiomatic questions considering the context? And is there any difference between the different interrogative constructions above in general?