I purchased the samsung galaxy s2 4 days ago, and am not satisfied with my purchase. The phone is running too slowly and im having problems with charging and application usage. Im also having problems with recieving calls, the person on the other linr cant hear me properly when I am talking on the phone. I want to exchange the phone, am I able to do so? What is koodo's exchange policy. Also, is the nexus 4 better than the gs2? Im not sure which of these I should switch for if I am able to switch.