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SIM keeps getting blocked on carrier's network

So, my SIM on the phone keeps getting blocked or freezing. This happened three times already.

Before anyone says anything, yes, I paid the bill :) (more details below)

4 months ago I woke up one morning and the SIM was not registered on the network, nothing worked. Going into safe mode didn't work. Doing a factory reset didn't work. What solved the issue is getting a new SIM.

About 3 weeks ago, this happened again! So, I did a little playing around. I even got a 2nd phone, exactly the same model. The SIM itself was locked as if I had entered the PIN wrong, but I didn't. The phone was completely accessible, other SIMs worked in the phone. I could not import/export contacts. When I changed the SIM at the carrier, it fixed this again. But, they told me they'd have to take my phone.

Today, this happened again! Same issues. I am tired of going to my carrier and having to prove to them that I paid my bill and this issue is theirs and it is ridiculous to have them take my phone since I need it for business.

Any ideas on what the issue is?
 
What did the network say.... if the sim really is getting 'blocked' then they should be able to say why.

(otherwise change carrier if you're fed up with them)
 
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