Graeme Wall writes:

Shopping malls have been doing a similar thing to send you "targetted
adverts" as you approach various shops.

How effective is this? Maybe I am unusual, but when I am shopping my
phone is normally in my pocket, so I would not see these adverts. Apart
from incoming (phone) calls, the only time I would look at my phone in a
shopping mall is when sat in a coffee shop or restaurant.