iphone 3 issues

I have bought a second hand iPhone and i have 2 issues with it..

1 is probably very simple: my camera is in some sort of greenish mode, how to switch that back to normal?

I inserted the simcard from my old phone but now it won't receive messages and calls and also it does not work with outgoing calls!


anyone recognize the problem or know what can resolve the issue??

 

resolved the green camera issue but not the simcard issue... the phone is supposed to be sim-lock free