mobile phone display

I recently bought a second hand Siemens C45 (virtually new – very little use) as an additional handset to the C45 I already have. The new phone has a faint/dull display. I have adjusted the contrast but it still is difficult to see compared to the original phone. Any idea how I can adjust this?

Sounds like you should bring it back...

Or at least compare the display on a new one in the shop to the one you have...