I suspect my iPhone are being spited on

Hi,

Some info: I bought a iPhone 12 in Feb 2021, from apple store, brand new and unopened. I am using a new network provider, a new nano Sim, new phone number.

The iPhone has never connected to anyone’s WiFi, not from anywhere, it has never connected to WiFi, ever. It stays at iOS 14.0 and of course no jailbreak. I’m using 4G only. I’ve never connect it to any device, no laptop no pc no Mac no anything, except the charger.

I’ve never install anything other than from the official App Store. I’ve only installed a few apps but they’re big brand like firefox google chrome.

I’ve setup strong passcode for login.

I’m asking if my phone is possible to be spied on? If the hacker has my phone number?

I think the culprit may possibly be WhatsApp, Signal, or iMessage.

My APPLE id has strong password more than 30 characters. WhatsApp Signal both have two steps verification.

The reason I’m suspecting is, there are Junk messages sent to my acc and is very suspicious.

Also, there are someone from work know exactly what my chat message are.

I use the phone normally but when it connects to 4g the phone became hot. This is definitely not normal. I believe there’s something wrong and suspicious here.

I think there’re people out there think I’m being paranoid but please be helpful and provide some advice thanks.