RAZR M - 4.82 x 2.40 x 0.33
RAZR M HD - 5.15 × 2.52 x 0.35
That's just based on the link you provided, who knows if it's actually legit. That's not a huge phone by any stretch, but I thought it was perfect in its original form. If the screen is truly 4.5, then I figured it would have to be bigger.