If you're using a dual SIM phone and both SIM cards are from Vodafone, you can change which SIM details are shown in the My Vodafone app
Go to your phone settings and choose which SIM card you want to access the network with. Find out how to do this in our device guides. Choose the make and model of your phone, then go to Connectivity.
The My Vodafone app will reset and you should see the updated details. If it doesn't suggest a reset automatically, then go to Settings > App Settings > Reset the app.