There is a pop-up on my iphone which is emerging intermittently. Can someone suggest if this is some kinda virus and if yes, then how to remove it? the content of the pop-up is:

THIS ACCESSORY IS NOT MADE TO WORK WITH IPHONE.
WOULD YOU LIKE TO TURN ON AIRPLANE MODE TO REDUCE AUDIO INTERFERENCE? U WILL NOT BE ABLE T O MAKE OR RECEIVE CALLS. YES OR NO.

please note that this pop-up does not shoot up only when i am using some application. it pops up at its own will.