hey guys Im finding all sorts of problems evaporate with my iphone 4 ive had it since the 8th of August. its slow, it disconnects on calls. the sensor for the light doesnt go off only sometimes does and it takes a few seconds and it just randomly puts my calls on mute? what should I do ive done a restore so far the slowness seems improved but Im not satified its the same as the day I pulled it out the box. but the sensor not turning off and the call disconnects and the call mutes? now its always saying no service Im having to reset the network what should I do apple in Australia told me there is no refubrisehed iphone 4 they are just brand new but you dont get the box you just get the handset if thats the case should I take it down ?