iPhone and MacBook hacking

Thank you for your replies. If you read the article, you'll see that hacking an iPhone is not difficult with spyware. Both my iPhone and MacBook have been seriously compromised. I don't know how they got through. Perhaps through my router, which wasn't secure enough. So how do I now secure both the iPhone and MacBook?

I recently bought a new iPhone SE and have since reset / wiped it clean multiple times. The phone is not on wifi or the cloud, I don't use Apple ID on it, and I don't text on it - only phone calls through US Cellular. They checked it and found no malware present. I am going to clean it again and set up the fingerprint touch devise and only use this to open it, rather than a security code. My linked article says that spyware can operate through cell tower signals. I read on another thread, that this might help: https://www.bitdefender.com/solutions/mobile-security-ios.html. Is this the best?

For my MacBook, Comcast installed a new router with a secure admin password, but we could not login without using the wifi password, so that is not secure. Comcast also provided Norton anti-virus software that I've installed. I've been told that wiping clean the computer and reinstalling everything might help, but I need to resolve the hacking source first. I used a thumb drive to share a doc on an older Mac computer and this infected the older computer so re-installing docs is going to be difficult.

I'm thinking of contacting these guys: https://www.codementor.io/hacker-experts