According to Wikipedia:
data is primarily contributed by smartphone users who have installed apps, such as OpenCellID[4] or OpenCellID Client,[5]
[4] https://play.google.com/store/apps/details?id=de.enaikoon.android.inviu.opencellid
[5] https://play.google.com/store/apps/details?id=biz.wolschon.android.opencellid.client&hl=en_GB
source: OpenCellID - Wikipedia
Links to both of those apps (de.enaikoon.android.inviu.opencellid & biz.wolschon.android.opencellid.client) return
We're sorry, the requested URL was not found on this server.
What happened? Why are these apps no longer available? And why does wikipedia still link to them?