No news of new app. - I'm on Android. I do get monthly email updating me of my subscription.Yah got new app. No information about a new app was shared with us by SIMBA.
Every month you should receive an email from SIMBA when they charge you the monthly fee.
SIMBA is doing some upgrades but I don't know what. Besides affecting login into app & sites, it also affects exchanging 5G SIM.
So as long as unable to login into app then better don't go waste time exchanging 5G SIM.