I haven’t been receiving my voicemails on my iPhone 12 Pro Max since I activated it on 11-13. I bought this phone without a carrier contract and just took my AT&T SIM card from my iPhone 11 Pro Max. I called AT&T today and reset the voicemail, but it’s still not working. It even shows no messages when I call into AT&T to check for messages. Not sure if maybe I need a new SIM card or not?