

What are you more worried about, third party, MitM interception (e.g. IMSI catcher) or Google knowing who you are communicating with? The former is technically harder for an attacker, but the use of such devices is well documented and poorly controlled. Google is, well Google. And you can expect them to monitize any bit of data they have on you. Also, that data will almost certainly be handed over to local law enforcement, especially if they have whatever the local equivalent of a warrant is.
As with most security, there are trade-offs. You have to decided what risks you are willing to accept and what you are not.







Time to bite the bullet and move the phone to Linux as well.