I presume you are on Android:
Regardless of your data plan or the network you use, you have to set your data limits and threshold on your phone. The message you are getting is only a warning and would not effect the functionality of your phone, its just a warning you are close to your data limits.
It would seem the warning threshold on your phone is still on the default setting. Your actual data limit can not be detected automatically and has to be set manually, to reflect your actual data limit.
To change your data threshold limits:
1. Click on SETTINGS (cog).
2. Click on CONNECTIONS
3. Click on DATA USAGE
4. Click on BILLING CYCLE AND DATA WARNING.
5. Click on START BILLING CYCLE ON, change the date to the date in the month your data limit refreshes.
6. Click the switch next to SET DATA WARNING to on.
7. Click on DATA WARNING, set it to 115 GB.
8. Click the switch next to SET DATA LIMIT to on.
9. Click on DATA LIMIT, set to 120 GB
Your phone will now warn you that you are nearing your data limit when you reach 115 GB, and will stop you using your data when you have reached 120 GB. This will stop you incuring charges for going over your limit.
Just incase you are on Apple, there should be something similar there.
Kind regards,
Simon.
