MyVodafone android app worked perfectly up to a week ago & then stopped working. Tried reinstalling & re-setting password numerous times. Get the 'Houston' error. This number does not exist on our network an absolute pain. etc etc.
The problem started when it asked for a password & never worked again.
The fact that the app has 4185 five star reviews but 2562 1 star reviews is really all I need to know. Lots of recent 1 star reviews. Not going to waste any more time with it.
Luckily Vodafone provide good information on how to manage buying addons by using texts. A bit old school but at least it works.