Two cellphones, one number?

Is it possible to have 2 cellphones with 1 number ringing simultaneously (i.e. 1x camera cellphone & 1x regular cellphone) but when you answer, only 1 of the 2 is authorized to handle the call?? If so, what cellphone providers actually allow this type of situation? If you can have 2 or more land-based home phones that ring simultaneously, why not cellphones??
Answer: i have seen it done on sprint but it was hard to do. do u have a job u cant have a cellphone with a cam? if u have cingular or tmobile u can just get 2 phones and swap sim cards when u wanna use the other phone

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Dont think this is possible as a phone # is only allowed to be matched with one electronic serial number.

What you can do, however, is program 2 phone numbers in the same phone and switch back and forth