What is the sum of all numbers in the dial of a keypad Mobile phone?

None of these

The numbers on a standard mobile phone keypad dial are:

0, 1, 2, 3, 4, 5, 6, 7, 8, 9

Let's calculate the sum:

0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45