<span>If a user name can have seven letters (with no distinction between upper and lower case), and if a letter can be repeated, then the maximum number of names is 26x26x26x26x26x26x26, or 8,031,810,176. That is, slightly more than eight billion names are possible.</span>
I think the answer to this would be true
They cannot legally check it without a warrant.
Depending on the circumstances of the arrest/check, and the method of seizure of the mobile device, you are subject to a certain set of rights, laws, or protections. First off, know that it is your right to decline the warrantless search of your mobile phone. If you are arrested or taken into police custody, you should verbally state that you do not consent to a search of your devices. A law enforcement agency is only permitted to conduct a warrantless search of your device if a compelling case for an emergency can be made.
If the authorities are using evidence obtained through an unlawful search of your mobile device against you in a criminal proceeding, you can move for that data to be suppressed under the Fourth Amendment right to freedom from incidental seizures.
It's a malware, and it basically let's the person/hacker/culprit get information off your computer without the owner of the computer knowing that the person is doing it. It's often used to find keystrokes, passwords, online interaction, and other personal data.
