We posted on HN for exactly this type of constructive criticism (though we do hope that there are a few quiet users who are enjoying our app and don't feel the need to post a plain back slapping comment that isn't really part of the spirit of HN anyway).
Privacy is something we take very seriously at OpenSignal. For one, we watched CarrierIQ get torn apart after it came to light the types of data that they were collecting of their users. Its obvious to us that if we ever abused our user's privacy the same thing would happen to us, so not only do we consider ourselves moral people there are clear market forces from preventing us from using your private data, which might be more reassuring to some.
We also only look at data related to your wireless service e.g. signal strength, data speeds etc and always anonymize it. It's worth remembering that not too long ago studies found that 50% of top android apps were tracking and collecting personal data such as IMEIs, phone numbers, sms etc and these are not crowd-sourced data gathering apps, this was a random sample of the top 30 android apps at the time of the study. With that in mind, we don't begrudge anyone who wants to check our privacy standards are up to scratch.