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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 abroad where different networks are available (depending on which operators Vodafone has roaming agreements with). 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
Your phone searches for networks within range.
A list of available networks will show on your display.
Your display will tell you if you've access to the network you've chosen.
2b - Select network automatically
Wait while your phone finds the network.