I have lost wifi and bluetooth connectivity for my iphone 4, tried switching off and charging over night, resetting network settings and removing sim but still cannot get connections?

You haven't put it in Airplane mode, have you?

I had the same problem too... still it is sometimes. The only solution I had found and worked is to heat the phone untill the sensor temperature is activated and at that point you can not use your phone for about 5 minutes. After that your wi-fi will work properly. But this problem will reappear at a moment.

P.S. If it doesn't work after heating, reboot. Now it should.