Excessive Google API Data Use while iPhone is Charging

Sometime around April 7 my phone started pulling crazy amounts of data from Google APIs. Looks like it spiked multiple times while charging overnight last night. Something is wrong. I got a notice from my ISP I was at 75% yesterday and got a warning that I was at 90% just now. ~200 GB in 24 hours!

I hadn't tried turning off wifi yet, but not shocked. I assume it's something trying to backup/update overnight. Just no way to see what it is or understand how/why it's burned through 400GB on my phone in the last couple of weeks. My phone is only 128GB what can it possibly be downloading... I've started deleting google apps (maps, chrome (reinstalled because I hate safari), google drive, etc). I did update ios last night and it didn't help, still burned through more data last night.

Over the last week my iPhone has downloaded 250.71GB of data from Google APIs(SSL) while on wifi (appears to be at night while charging).

I am having the same issue with my wife's iphone. It downloaded 40GB from Google APIs(SSL) last night alone. She has a 64GB iphone 12. This is not backup, and is definitely new behavior as of three weeks ago. It is heavy on downloading.. 40GB down / 60MB up. This phone is on 17.4.1 and has been restarted/reset with no effect.

I'm having this exact same issue but with an updated IOs iPhone 12 at the same time overnight when I'm asleep (no other users in my house). Hotspot is off (whatever is doing this was going through my hotspot until I turned it off yesterday).

Let me know if the cell data was still going if your wifi was off. I'd turn my phone off at night, but I need to be accessible. Last update to iCloud was an hour before this activity according to my iPhone. This is also larger than the amount of data I even have on my iCloud, so it's definitely not related.

I'm about to get ridiculous charges from my ISP because I'm using 2TB of data a month because of this. This is not the same as previous bugs where the data is just showing as used on the phone but the ISP isn't confirming use. This is absolutely data moving confirmed via router and ISP.

If I could detail the source, I'll stop it. again, hotspot is OFF and password is changed. No unknown devices connected to iCloud and passwords have been changed.

Please let me know if you find a root cause. I'd hate to have to not have an iPhone to avoid an ISP overage every month.

So far the reinstall of iOS on my phone seems to have fixed the problem. I'm not sure what exactly the issue was but it caused me to double my internet usage and overages fees on Comcast. Pretty ugly bug. Seems like there should be safeguards in place on iOS to protect against massive data pulls on wifi.

I’m having the same issue. I’ve been working with my ISP but they’re blaming Apple. I called Apple and they weren’t any help. It’s HUGE amounts of data, more than my phone even has for storage which is highly concerning. I deleted anll of my Google apps and a bunch of other apps that I dont use and I still see my phone trying to reach out to Google - which is now being blocked by my firewall.

Do you have automatic backup on?

Your phone backs up when connected to power, WiFi and is idle overnight.

The problem has not got any better for me. I finally resorted to wiping and reinstalling ios on my phone. We'll see tonight if I continue to get the huge pull from google apis.

Did this resolve your issue?