This thread is now archived and closed to new comments. Some of the links and information provided in this thread may no longer be available or relevant. If you have a question please post a new topic.
In order to get to the bottom of what's going on here, there are a few things I'd like to know.
Did you do a change of number or sign up a new service that came with a new number? When did you make the change? Are you logged into the app using a username and password or just using mobile authentication? Have you tried removing the app and reinstalling?
Please let me know and I'll do my best to help you resolve this issue.