I'm trying to troubleshoot a problem with the My Vodafone iOS app on an iPhone 4.

The app was working fine up until an iOS7 install - via USB / iTunes, not OTA.

When the app is opened, it goes through the usual Please wait / signing in / retrieving account info process, then pops up an error message "Your Online ID needs to be setup correctly. To resolve this, please call us on 777"

A call through to mobile support on 777 seems to indicate there is nothing wrong with the online account from Vodafone's end.

Phone has been rebooted, app deleted and reinstalled both through iTunes on a computer, and from the App store on the phone - still no go.

The password is correct - entering an incorrect password to check brings up wrong password (or similar) message.

Account can be accessed fine from the web portal.

Given the phone had only recently been moved to iOS7, I'm leaning to that being the cause - can anyone else confirm if the My Vodafone app is functioning correctly with iOS7?