Weird Messages Received from Non-Existent Numbers and More

I believe the main concern is that somebody tried to sign in to something somewhere with your Apple ID and correct password for you don’t get the 2FA verification popup on your trusted device until somebody actually enters your Apple ID and correct password on an untrusted device or browser. 2FA doesn’t kick in without the correct password. If you use the same email address for multiple online accounts including your Apple ID and you use the same password on some or all of those online accounts, then somebody could have hacked your password from one of those accounts including the email account itself and then just guessed that you might have an Apple ID account and might use same for it. If your Apple ID is signed into iCloud or iTunes or App Store or Messages et c. on any iOS or macOS device, the device will show up in your Apple ID devices list. I believe the attempt was defeated by the 2FA verification process but you should check your Apple ID devices list any time something like this happens. On the iPhone, go into your Apple ID settings and scroll down to the bottom. You should see your iPhone and any other iOS or macOS devices your signed into with your Apple ID and hopefully none other. If somebody signed into icloud.com via a browser, though, I don't think that would cause the the device to show up there.

iOS doesn’t support remote control. Remote viewing can be done with specifically designed apps but not without such app running and you approving the session. The 2FA verification request that seemed to get approved without your help didn’t happen by remote control and the verification code that seemed to get dismissed without your help wasn’t remotely viewed by anyone so I’d be concerned if I had any other 2FA-trusted devices that somebody else had access to. Otherwise I’d chalk that and the other similar effects up to some kind of touch screen digitization fault maybe related to some combination of ESS environmental conditions including the material science of the iPhone jacket and screen protector. You can always mitigate that possibility by holding the iPhone up off the table or file cabinet in one hand while massaging it with the other. Anyway, you would not be the only one to experience these types of display digitization fault effects lately.

The “Hey!” text was obviously just spam. The other unexpected texts, as you may have by now surmised, are just iMessage iPhone phone number SMS capability re-up texts. A common but not so well-known thing. Presumably any time you enable or re-enable or activate or re-activate either iMessage or FaceTime or install or re-install a SIM, these SMS messages occur in order to verify that the iPhone phone number is SMS capable as it needs to be in order to be used as an iMessage or FaceTime address. With some carriers e.g. big-time carriers in the U.S., these messages are silent, free, and un-billed (literally don’t show up anywhere including the bill) at least while on their network. Otherwise it all depends on the carrier, location and whether you’re roaming. Sometimes if you’re roaming internationally, they are silent but billed. In your case they aren’t exactly silent and I assume they are billed. Per agreement between Apple and Turkcell, Turkcell is responsible for all iPhone support for Turkcell subscribers. That plus the fact that SMS is a core cellular function, you either lump it or get ahold of Turkcell or visit their support website to resolve your concerns.