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Not an encrypted messaging system that is linked to your phone number and thus to your IMEI number. The base station knows which IMEI it is talking to. It (and the other basestations) know the signal power and can triangulate your location. Any app which has location information (or the many who already sell it) could provide your location. If your IMEI was unknown (your carrier database must be more secure than most) then it could still be statistically found by tracking location and signaled IMEIs.

Meta data is much more powerful than is commonly supposed. Timing attacks are at least as effective as keystroke statistical attacks, which are real. You're better off, if both of you are running VPNs all the time and have lots of background traffic on the same connection.



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