Here's how to manually select a network on your Nokia Lumia 820:
- From the Start screen, swipe to the left.
- Scroll down to and tap Settings.
- Scroll down to and tap mobile network.
- Scroll down to and tap the Network selection dropdown.
- Tap tap to select.
- Wait whilst the handset searches for available networks. Click Next to continue.
- When the search has been completed, tap tap to select.
- Tap EE.
That's it - The network has been manually selected for your Nokia Lumia 820.