I would like to purchase a jammer

I would like to purchase a jammer that will allow me to enjoy a meal in a restaurant with out selfish people ruining it for me. I almost got into a fight at the weekend over this and want to spare myself and my wife from the stress of such unnecessary confrontations.

I bought one a few years ago that was very effective and had about a 10meter range. It was also only the size of a cigarette packet.

However, I foolishly leant it out and never got it back. Regardless, I doubt that it would be suitable against the latest bands anyway.

Could you advise me on a product that would suit my simple needs and that is creditable and effective against 4 and 5G as well as wifi – in order that they don’t just start making WhatsApp calls when the phones’ band widths are jammed?