Why do models or famous people have both a blackberry and an iPhone?

So I've seen many models/supermodels and celebrities that have a blackberry and an iPhone at the same time like they carry both and I never know why?!

Iphones are Blackberrys are the hot thing right now.
They might have 2 phones, for like 1 phone for work and the other phone for family and friends.

Yeah, both phones are really in right now. Probably one is for business and one is for their personal life.

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