[jillesvangurp]

No need; phones use sensor fusion these days. Wifi, ble, 4G/5G base stations, signals, etc. it's all taken into account. Which is why you can get accurate position in a lot of places where you definitely don't have any line of sight to any GPS satellites. Some of the more recent wifi standards also have some positioning features.

[cryptoz]

Early Android dev had a guide on how devs could pick the best location from various sources individually, and it was massive pain with dubious results.