ASP.net Mobile + unique identifier

I am building a website that i will also have some mobile pages, instead of having the user login in from their phone is there anyway to pull the user phone number so if they had entered the phone number via the web before, the page can look up who they are from their phone and give them their infomation.  Or some other kind of unique identifier that is possible to pull from the user's phones.
dkilbyAsked:
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o0JoeCool0oCommented:
Not unless u set it up that way. Like manually give the phone a cookie with the phone number in it.
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o0JoeCool0oCommented:
will they be using a PDA device web browser with cookie support? You could use a cookie to authenticate them the cookie would contain a valid authentication code and could be saved to the device via a one time login page where they enter a user and pass and then are given a valid authentication cookie.

from then on the page looks for the cookie first if no cookie then redirected to the "get cookie" login page
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laotzi2000Commented:
From security's point of view, what you want to achieve is really a bad idea.
Phone number can change and when one person cancel a phone, his number might be assigned to another person. Do you want him to see another person's information?
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dkilbyAuthor Commented:
the infomation they are accessing it not something secure, and the user could update their infomation if they change phone numbers, just wondered if it was possible to grab the phone number when they use the phones browser.
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dkilbyAuthor Commented:
so the bottom line, even though i am not looking for security, there is no way to retrieve the users phone number when they go to a page, i would need them to log in and then write a cookie to the phone.

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o0JoeCool0oCommented:
Right theres no way to say "get mobile device phone number" you have to manually put that phone number in somewhere on the device to be read by the web page.
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