Yikes!
My limit (before I pay extra) is 300 MB/month. The amount consumed by the Google stuff has skyrocketed in the last few months. My total usage is now getting disturbingly close to the limit. I have disabled network access to many apps, but the biggies so far this month are Google Play services, Google and Google Play Store, in that order. Android OS is down a bit later. Hmm. Why has "Setup Wizard" used 2.26KB? My phone is 7+ years old! I likely *can't* disable access to those top 3. ... Well, it did let me restrict all 3 to WiFi only, so maybe I'm safe! But..., I'll have to see if I still get notified of incoming gmails and emails.