This may not be related, but thought I'd mention that my Maxroam sim (which use the same back-end as Celtrek) has not worked in about a week. And I can no longer log into my account as of 3 dys ago. Even though before then, I could log in but not do much because they were going through some maintenence.
Here is the msg I get
-------------------------------------
We are sorry but either an error has occured on our system, or your account is no longer active on the MAXRoam system. If you feel this message is being displayed to you in error, please contact
team@maxroam.com
Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile