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There seems to be a temporary issue with the Application at the moment but it should be working correctly later today.
If there are still issues later, I would suggest going into the Application settings and resetting the App. You can also go into the App from your settings, clear cache and data, also make sure you have the latest version of the Application from App details in store. Reboot the phone and log in again.
You can also speak to Vodafone using live chat or calling or contact the Social Team here: Contact Us