Fitness Data leak and scammer message

Start : never publish your private information such as phone number in public forum, as you did here in your initial post.

To keep your Apple ID account secure, see the following Apple articles: 

If you think your Apple ID has been compromised

If you think your Apple ID has been compromised - Apple Support

Recognize and avoid phishing messages, phony support calls, and other scams

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

See who has access to your device or accounts

See who has access to your iPhone or iPad – Apple Support (UK)

Delete suspicious content from your devices

Delete suspicious content from your devices – Apple Support (UK)

Check your Apple ID device list to see where you're signed in

Check your Apple ID device list to find where you're signed in - Apple Support

• if you see devices that don't belong to you, delete from your account.

Personal Safety User Guide -> Personal Safety User Guide – Apple Support (UK)

Manage and use your Apple ID -> Manage and use your Apple ID – Apple Support (UK)

(if you haven't already done this) Two-factor authentication for Apple ID -> Two-factor authentication for Apple ID - Apple Support

Change your Apple ID password -> Change your Apple ID password - 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.

Then see this Apple article: What to do after you change your Apple ID or password

What to do after you change your Apple ID or password - Apple Support

Never jailbroken your iPhone.

SpacyBicycle284 Said:

"Fitness Data leak and scammer message: Yes I agree but it is a scammer computer operated number. And the fitness sticker was important so that apple knows the data leaks happening and other people can be wary of it. My main question how was a scammer able to utilise private fitness info”

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Report Items to Apple:

You can report what seems to be scams. To do so, report phone calls' and messages' info to Apple and others. So forward the screenshots to Apple and the whomever else you think should know about it. Use my User: Using the Photos App to Report Scams - User Tip

See the Apple articles below: 

Block phone numbers, contacts, and emails on your iPhone, iPad, or iPod touch

Block phone numbers, contacts, and emails on your iPhone or iPad - Apple Support

Block, filter, and report messages on iPhone

Block, filter, and report messages on iPhone – Apple Support (UK)

Ask you carrier to block that phone number.

SpacyBicycle284 Said:

"Fitness Data leak and scammer message"

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IMPORTANT NOTE:

Keep Personal Info OFF of these and all other public Forums These forums are here for everyone out there to view. So, just be certain to keep personal information(Phone Numbers) off of these forums and other forums too. Anyone out there can read this info. For your Security & Privacy: I have asked the host to rid of the images you've provided. :)