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When you turn on your phone, it will automatically choose a network within range. Sometimes though, it might be useful to choose your network manually for example, when you're travelling abroad and there are different networks available. Follow these instructions to choose a network.
Find "Mobile Network"
Select network manually, go to 2a.
Select network automatically, go to 2b.
2a - Select network manually
Press Scan for Available Networks.
Press the required network.
Your display will tell you if you've access to the network you've chosen. If the display tells you that you don't have access to the selected network, it's because Vodafone doesn't have a roaming agreement with the network operator.