Android defaults to sending the IMSI (SIM ID) to Google.
> SUPL is used as part of the A-GPS (Assisted GPS) system to get a faster Time to First Fix. The problem is that Android's implementation automatically sends the IMSI (ID of the SIM card) to the SUPL provider for no apparent reason. And because Google is the default provider it's a big breach of privacy.
> SUPL is used as part of the A-GPS (Assisted GPS) system to get a faster Time to First Fix. The problem is that Android's implementation automatically sends the IMSI (ID of the SIM card) to the SUPL provider for no apparent reason. And because Google is the default provider it's a big breach of privacy.
https://github.com/Magisk-Modules-Alt-Repo/supl-replacer
https://en.wikipedia.org/wiki/Assisted_GNSS