Depends on what you looking for.
SMS while not encrypted is not directly visible to Big Tech nor Big State. Big State requires a court order to access SMS, Call Logs, Wiretapping, cell network information on your imei, etc. There is no way around this court order level of surveillance, if Big State deems necessary. Of course your Cell provider has all of this data, but they operate fundamentally differently than Big Tech (Goog, AWS, Apple, Meta).
Big Tech platforms (including Apple) sell your information to Big State (US, China/CCP, Walmart, Amazon,...) - literally anyone that will buy it with the caveat that it's "anonymized". Do note that Big State (city, county, state, federal) IS purchasing Big Tech platform information on us. Are they tracking you specifically? No but they can mine the data now or sometime in the far distant future if they so choose, all WITHOUT a court order since you Opted-In. This data can then be statistically narrowed down to "un-anonymize" you specifically. How many people live in your neighborhood, sleep at your address, travel consistently with your wife's phone, visit your parents neighborhood, .AND. spend working hours at your workplace?
With GrapheneOS and unconnected FOSS apps, the Big Tech platforms never have your data to begin with.