I have been having this issue of 'refreshing SIM data' message since February. I have also lost mobile signal while at home (my husbands Virgin phone still has full signal so we have network signal at home). I have had a new SIM but still having same issues. Tried fixes on here and also doing a full reset but still have same issue.
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I am really sorry to hear that you're getting this message. Would you mind clarifying what diagnostics and troubleshooting you've performed thus far, please? This way we can ensure that nothing is repeated where possible, but also that nothing is missed either.
I too have been having this issue with "refreshing SIM data" for the last two months. I live in an area where the Virgin mobile phone signal is very weak, as mentioned above in posts - so I can make a call in some rooms of my house but not others. My wife's phone (also on Virgin) has started having the same issue. In addition, both of our phones have started showing the "SIM card manager" page without us requesting it (it can also be reached via settings). Under the SIM it says Unknown where it should say Virgin and then under that Unknown Number. This keeps interrupting what I am doing (e.g. watching TV on phone) and it has got so bad that I am having to put the phone on airplane mode with just wifi.
I read the set messages in this topic with great hope there would be a solution, but it seems there is no solution despite it being long standing.
I note that your competitors have a cheaper offer with greater allowances. I guess they also do not have this problem.