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Can you log in to, for instance, either your Google.com account, or your Yahoo.com account? (whichever one is your search engine.)
- if so, then you don't have your account taken over.
- if not, then your account may have been taken over, hijacked, or similar infringement.
The way to recover from the second case is, to turn Off all other devices but one, that you might be logged in on. (Or if you have a Google.com account, you use the facility for logging off *everywhere*... admittedly not much use if you aren't logged in anywhere... and then start over from one device.)
Then, on that one device, change your password ***** the account. Change your password, after making sure the one device itself is not hacked into.
If it is a Windows device use a reliable anti-virus scanner on it, and also make sure it has a *good* firewall enabled on it.
If it is an Android device, the following applies:
If your phone has (presumably!) the Android OS on it, then if that OS version is not sufficiently updated, then it may contain a significant 'security hole' that allows almost anyone to gain access and control over your phone.
To test as to that security hole, download and use this app:
to tell whether there is such a security hole in your phone's Android operating system.
To avoid the problem in the first place, not just using the Stagefright detector, but also completely updating your Android OS ab initio when you first start using it, is a good idea.
(Some older versions of Android OS cannot be patched, by merely updating that version... but a higher version, if it can run on the older Android OS -compatible phone, can cure that problem.)