iPhone 3G Battery life, slow

Hello

Yesterday i got my iPhone 3G and the battery life is very poor compared to the old iPhone.

I disconnected the iPhone from the charger at 8AM i did like 16 calls today is 5:17PM and is already less than 5%, i used GPS for like 3 minutes and the internet maybe 10 minutes.

Or is something wrong configured or the battery life on this new iPhone sucks.

Also is slower than the old iPhone.



Its going to cost me around 150 Dlls a month on unlimited data plan