I found a phone that is similar in size to Centro.
If you wonder how a Centro will fit in your hand, just go to
a Verizon store and look for the LG VX9400.

Verizon LG VX9400
4.04" (H) x 1.93" (W) x 0.73" (D)
Weight: 4.06 oz

4.22" (H) x 2.11" (W) x 0.73" (D)
Weight: 4.2 oz