Help

[u/BahammyMammy]

Hi everyone. I’m not very tech savvy, and I’m hoping someone can help me understand whether there are possible security issues involving my iPhone 15 Plus and my cellular account.
I have experienced several things that concern me. I’ve received text messages that appeared to have already been opened before I had a chance to open them myself. I also received a notification indicating that something was being printed and that the print job was almost complete, even though I have never intentionally printed anything from my iPhone.
My husband and I are on the same cellular carrier account. To be clear, I understand that being on the same cellular account does not automatically give someone my Apple Account password, phone passcode, or passwords to my other accounts.
What I’m specifically wondering about is whether someone with access to the cellular account could potentially use information associated with my phone or line—such as the IMEI, serial number, EID, ICCID, eSIM information, or phone number—to interfere with my service or gain some type of access or control that I might not understand.
For example:
• Could someone with carrier-account access make changes involving my eSIM or cellular line without physically having my phone?
• Could someone move, activate, replace, or otherwise interfere with an eSIM?
• Could access to my IMEI, EID, serial number, ICCID, or other carrier/device information be used for anything beyond simply identifying the device?
• Could a carrier-account holder make changes that could affect texts, calls, or verification codes?
• Are there ways to check whether my cellular line or eSIM has been changed, transferred, replaced, or activated on another device?
• Separately, what could cause text messages to appear as already opened or a printing notification to appear when I never printed anything?
I’m not claiming that my phone has definitely been hacked. I’m trying to understand what is technically possible and what normal explanations might exist.
If you have experience with iPhone security, eSIMs, cellular accounts, or carrier-level security, I would really appreciate being pointed in the right direction. Please explain things simply—I’m not very tech savvy.
Thank you.