Scan for Available Networks - BlackBerry® Bold™ 9930 Smartphone
From the Home screen All tray, select Options. To expand the tray, press the Menu button then select Open Tray.
Select Mobile Network.
Select the current option in the Network Technology field.
Select the current option in the Network Mode field.
Select the desired Network Mode option:
3G & 2G
Select the current option in the Network Selection Mode field.
If prompted, select Scan for Available Networks.
Select the desired available network then press the Menu.
Select Select Network. The preferred global carrier is automatically selected. You can manually select an alternate carrier but it may require as many as six registration attempts with that carrier prior to successful registration.