Verification failed and change of SIM card
I changed my sim card in my iphone (iphone 6s plus) and I was using it with a different sim card for almost 6 months. Suddenly, my phone seemed like it crushed, the verification keeps failing and I cannot access my apps. I also receive a message that my icloud is disabled. I switched back to my previous sim card and it is the same. I connected to Icloud.com and changed the password and nothing. I have reset my phone as well. It also doesn't connect to itunes. I don't know what to do. Any advice, welcome!
iPhone 6s Plus, iOS 14