iPhone 4 not synching with iCloud or Macbook

Hi,

I have an iPhone 4 that is not synching with iCloud correctly. For contacts there is over 500 on my phone and only 41 in my iCloud. Also, there is a similar issue when I synch through iTunes (10.7 version 21). I run a MacBook with Snow Leapord. Any ideas on what I must do?

Thanks!