What should I do,my iPhone is hacked

We all get scam messages. That doesn't mean you phone has been hacked.

See this link about Phishing Scams --> Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Gold_don Said:

"I regularly get scam messages”

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Malwarebytes Mobile Security:

You might want to consider using the paid version of Malwarebytes Mobile Security on your iPhone. Its free version, blocks out known scammers. Read the following post to see how to use this software: Blocked numbers - Apple Community

Screenshot:

Gold_don Said:

"What to do,when iPhone get hacked"

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Scam Messages:

Getting Messages of sorts about this? If so, it is a scam - so report this to Apple: Go Here: Using the Photos App to Report Scams: - User Tip

If you didn't jailbreak it, your phone is not "hacked".

What is happening that leads you to think it is?