Help to remove possible virus

A

AC Question

(1)My smartphone (android 5.1) is continuously been taken over by screen advertising asking to download various apps. This can happen, even, while dialing a phone number. I've removed a apps that I installed in the recent past without luck. How do I stop this?
(2) Also, when I switch off the phone or put it in aeroplane mode I have to go through abprocess of rebooting the phone in aeroplane mode and then turning off aeroplane mode for the phone to recognise the SIMs.
(3) I frequently get a splash up saying "shell was denied access to location"
(4) for the past few days I've had a download "Cancelling" with the download arrow continuously flashing in the top of the screen.

All these started within the past couple of weeks, any help to fix this would be much appreciated.
 

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