From recent experience from friends and tested myeself too, basically the only Unicom shop left which sells to foreigners with their passports is this one:
这里是：中国联通(护国路3G营业厅),护国路24号附近,详情：j.map.baidu.com/fwJGb

Xiaomi has recently started to sell a system, looks interesting

I also have to buy a TV, and was tempted by both Xiaomi and leTV. I guess they include a basic channel package for free, plus extra paying ones. Is there somebody who has tried both systems and would suggest one or another one here in Kunming? Thanks

I was also in Dali till Monday. That really worrying pollution that burnt my eyes and throat was obviously way more important than due to traffic. The fires at the border with Myanmar are really the only plausible thing. A friend of mine found evidence of those fires on a specific web site for fire management.
Despite the rain, that fume smell was quite detectable here in KM this afternoon too.

After many masks I tried, I am happy for now with the Totobobo one. Not fashionable, portable and soft as the fabric ones of various colours you buy in girl shops for less than 10Y, yet the seal around the mouth makes a big difference. I was inserting two different PM 2.5 filters into the nice fabric ones that go around the ears, but I was still worried about the space at the sides of the nose. With this new one, I took only two days for its two filters to become grey. That means less than 20km of cycling, done before this exceptionally high pollution! I will swap its original filters with some 3M ones that look thicker, though!

the above is chit chatting to me as been already tried or done for years. I just need a solution, if you have one.