The issue has persisted for me as well. I have just ordered a new SIM. Hopefully I'll have functioning service in 3-5 days. Another family member has had less severe issues with their 48 service a few days ago - am unsure whether it has fully sorted ...
Says "SIM card is locked. - Emergency calls only" on my phone since yesterday. Was working fine before yesterday. My phone is LTE compatible. Other family member had very poor phone service yesterday. Incoming calls were going straight to answering '...