Where the signal strength icon is there is GSM displaying under it and i am unable to recieve emails or use my browser

Before you even start trouble shooting ask yourself whether your phone may be barred from the network if it is stolen or the account holder did not pay their bill....If this is not the case then ensure that your phone is powered on. Hold the power button down for a full 3 seconds. (The power button is often located on the top of your phone. Please refer to your user guide for the location of the power button for your specific phone). Confirm that your service is active. If you are unsure, contact your service provider.
Check that you have sufficient network signal strength. When you are at the start screen or in a call, the strength of the radio signal is indicated by the signal indicators on the left side of your phone's display. These indicators move up as the strength of the signal increases and down as the signal decreases. To increase your phone's signal strength, try moving your phone slightly, or move towards a window if you're calling from inside a building.
If you are still unable to place a call, please contact your service provider. If they are unable to assist you, please submit your phone so it may be inspected for repair.