Why has there been such an increase of phishing going to my inbox that was directed to spam

You can't stop receiving them to your main email accounts, you can only block them, classify them as junk or spot and delete.

On the phone itself you can only move them to junk folder so that the wider and local system can build filter memory and divert to junk folder.

That's all there is for the "using iphone" forum.

Whatever your mail provider is you can create "rules" in your email account on a computer or most ipads. Each provider offers their own options, do a web search quoting your provider.

I gave two senders masquerading as teo firmer sports club members and I have a rule to send them to the trash. Not on the phone but in my Outlook.com account,

As for spotting them

Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

I would not advise security apps that advertise phishing protection as they bring mote problems with them but there are some that somebody may recommend

The senders are getting smarter.

You asked why, not how to stop them.

Do you wish to change the question?