how to scan iPhone for virus

There are no AntiVirus scanning products for iOS/iPadOS. Due to the sandboxed security architecturean AV process is unable to scan the filesystem.

Providing that you have not attempted to jailbreak your device - or have bypassed protections by side-loading third-Apps (if you don’t know what this isthen don’t worry about it)then it is highly unlikely that your device will have been infected with a virus or other malware.

Most alerts that you see are pop-up messages from websites - these being designed to scare the unwary into giving away sensitive information - or to fool you into doing something that you shouldn’t.

Due to the system architecture of iOS/iPadOSunless jailbrokenyour iPad is not susceptible to traditional malware infection per-se. Howeveras with all computer systemsthere are still vulnerabilities and exploits to which you remain at risk.

Browser-based attacks can largely be mitigated by installing a goodtrustedContent and Ad-blocking product. One of the very best and most respected within the Apple App Store - designed for iPadiPhone and Mac - is 1Blocker for Safari.

https://apps.apple.com/gb/app/1blocker-for-safari/id1365531024

1Blocker is highly configurable - and crucially does not rely upon an external proxy-service of dubious provenance. All processing takes place on your device - and contrary to expectationsSafari will run faster and more efficiently. 

Unwanted content is not simply filtered after download (a technique used by basic/inferior products)but instead undesirable embedded content blocked form download. A further benefit on metered servicessuch as cellular connections where you data may be capped or chargeablethis not only improves speed but also saves you money.

When using a good quality Content blockera high proportion of otherwise inescapable risk when using your Safari browseror linking to external sources from emailis effectively mitigated before it even reaches you.

There are additional protections that can enhance protection furthersuch as using one of the better Recursive DNS Services in preference to automatic settings. This can either be set on a per-device basis in Settingsor can be set-up on your home Router. I recommend using one of the following servicesfor which IPv4 ad IPv6 server address are included here:

Quad9 (recommended)

9.9.9.9

149.112.112.112

2620:fe::fe

2620:fe::9

OpenDNS

208.67.222.222

208.67.220.220

2620:0:ccc::2

2620:0:ccd::2

Cloudflare+APNIC

1.1.1.1

1.0.0.1

2606:4700:4700::1111

2606:4700:4700::1001

Use of the above DNS services will help to shield you from “known bad” websites and URLs - and when used alongside 1Blockerprovides defense in depth.

I hope this reassurance and guidance proves to be helpful in resolving any issues with malicious websites.

You don't need to and can't. Apple's defences prevent malware from affecting itand also stop any scanners from checking files other than their own documents.

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