Update last version and security
iphone 6 security and safe browsver
iPhone 6, iOS 12
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It is not possible, iPhone 6 is an outdated iPhone (9 september 2014), can’t be update to a higher iOS.
iOS 12.5.5 is last security updates for iPhone 6 -> released 23 september 2021.
To keep your Apple ID account secure, see the following Apple articles:
Manage and use your Apple ID
Manage and use your Apple ID – Apple Support (UK)
Recognize and avoid phishing messages, phony support calls, and other scams
Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support
Identify and filter junk mail in iCloud
Identify and filter junk mail in iCloud - Apple Support
If you think your Apple ID has been compromised
If you think your Apple ID has been compromised - Apple Support
Create a strong password for your Apple ID, It is best if your password consists of eight or more characters and include upper and lowercase letters, and at least one number. You can also add extra characters and punctuation marks to make your password even stronger.
Never provide your password, passcode, security questions, verification codes, recovery key or any other account security details to anyone else. Apple will never ask you for this information.