I have a Kogan SIM installed in an iPhone 15. I was away for over three weeks and didn’t use it at all (was using different eSIM in the same phone and Kogan was switched off). When I returned I noticed some strange behavior: every time I call this Kogan number, it goes straight to voicemail. However, if I immediately redial, the call connects. After that, it continues to work normally for a few minutes. I can redial and it connects on the first attempt, but after some time, it reverts back to the same issue.

Has anyone experienced this before? I have not looked into this yes, was planning to try this SIM in a different phone.