Icloud memory

Who sends you those messages?

See -> Identify legitimate emails from the App Store or iTunes Store

Identify legitimate emails from the App Store or iTunes Store - Apple Support

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

⤵️

If you receive a suspicious email or SMS text message that looks like it's supposed to be from Apple, please email it to reportphishing@apple.com.1

If you receive a suspicious FaceTime call or link to a FaceTime call in Messages or Mail, please email a screenshot of the call information or link to reportfacetimefraud@apple.com.

How to report suspicious emails, messages, and calls

• If you receive a suspicious email that looks like it's supposed to be from Apple, please forward it to reportphishing@apple.com.1
• If you receive a suspicious FaceTime call (for example, from what looks like a bank or financial institution), email a screenshot of the call information to reportfacetimefraud@apple.com. To find the call information, open FaceTime and tap the More Info button  next to the suspicious call.
• If you receive a suspicious link to a FaceTime call in Messages or Mail, email a screenshot of the link to reportfacetimefraud@apple.com. The screenshot should include the phone number or email address that sent the link.
• To report a suspicious SMS text message that looks like it's supposed to be from Apple, take a screenshot of the message and email the screenshot to reportphishing@apple.com.
• To report spam or other suspicious emails that you receive in your iCloud.com, me.com, or mac.com Inbox, send them to abuse@icloud.com.
• To report spam or other suspicious messages that you receive through Messages, tap Report Junk under the message. You can also block unwanted messages and calls.
• Report scam phone calls to the Federal Trade Commission (U.S. only) at reportfraud.ftc.gov or to your local law enforcement agency.

Never jailbroken your iPhone.