Because it is cheaper to call to a mobile phone from a mobile phone as opposed to from a fixed phone to a mobile phone... and vice versa. Also, they might have the same service operator for their mobile phone service as I have, but might have a different operator for fixed line service... Thus they prefer to phone from and to the same operator because it's cheaper.
PS: We have one of the highest rates in Europe when it comes to mobile phones, tv, fixed phone lines and internet services.
EDIT: Both numbers are the same except the first two numbers, for the fixed line it's 27... for the mobile phone it's 79.
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