Nokia Lumia 920

Slide your finger left on the display.

Press Settings.

Press mobile network.

Select one of the following options:

Select network manually, go to 2a.

Select network automatically, go to 2b.

Press the field below Network selection.

Press tap to select.

Your phone searches for networks within range.

Press tap to select.

A list of available networks will show on your display.

Press the required network.

The display will tell you if you have access to the network you've chosen.

Press the field below Network selection.

Press automatic.

Wait while your phone finds the network.

Press the Home key to return to standby mode.