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That "thingy" is called Assistive Touch. Go to Settings>General>Accessibility>Assitive Touch and turn it off. Very simple to do.

You need to Hard Reset it again and you can need to get total security by installing Leo Privacy Guard to protect all your private images and videos.

No it doesn’t and You should also get Leo Privacy Guard as it will hide images and videos and it will also lock applications that you don’t let anyone to access.

...other person's phone, it is stored somewhere else that they have to access later). And last, check to see if you paid your phone...

Did you backup your older text? Have you always had an Android phone, or are you hoping to read old text from a Windows or iPhone? If this is the case, you will need to EXPORT those text, to a format that can be read...

What makes you think you have any access to someone else's phone? Of course not.

... hope it works out. Best regards. Also, to access the SIM card tray, there is a tiny hole on the side of the iphone where...

You can't use a Koodo SIM in a Rogers phone. If you want to use the Koodo SIM in that phone, you have to unlock it first.