How do I remove Trojan viruses from my iPhone Pro 12

Liggman1 wrote:

I’ve restarted my iPhone and still have problems with call‘s getting disconnected and? Please see the attachment notification that I received from Apple.

That advertisement was not from Apple, and that format of advertisement is a common scam.

Apple does not use "attention.network" as its domain, either.

Click or tap > Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Calls getting disconnected is either a problem with the cellular carrier network and its coverage such as marginal signal coverage, with local signal interference, or a hardware problem with the iPhone itself. Try a different location with better coverage. Try restarting your iPhone, too.

Click or tap > Restart your iPhone - Apple Support

And the general steps for problems making or receiving calls:

Click or tap > If you can't make or receive calls on your iPhone - Apple Support

Please describe the symptoms of this “Trojan virus”.

It’s just a scam to get you to install something you don’t need nor want. It is impossible for a remote site to know anything about your device.

Than message is also NOT from Apple.