>...how many people are there consciously not buying a smartphone in fear of it being used to spy on them...

I'd say that the number is relatively small to non-existent but that might have more to do with the fact that cell phones are more a requirement for day-to-day life than anything else.

For example, try to sign-up for paging services, as a means to replace your cellphone with a passive-only device, and see how far you can actually get with that idea.

Or try to buy a CRT-TV.[0]

At some point you have to concede that means to go against society's trends are no longer there, unless you make them yourself - and most people either don't have the resources nor the time or a combinations of either to do that.

[0] - https://www.amazon.co.uk/s/ref=lp_560864_nr_p_n_feature_thre...