Open "Settings" app ,
- tap on "Network & Internet" or "Mobile network",
- tap on "Data usage",
- enable data usage or mobile data, if needed,
- tap on "Mobile data usage" of each SIM card, if needed.*

* Dual SIM devices: tap on SIM 1 or SIM 2 to check each data consumption.

To set a warning and a threshold limit to control monthly data usage:
- open "Settings" app ,
- tap on "Mobile network",
- tap on "APP data usage",
- enable on "Data usage" (if needed select a SIM card)*,
- tap on "Data warning & limit" ,
- tap on "Mobile data usage cycle" and enter a date corresponding to your billing cycle,
- enable "Set data warning",
- tap on "Data warning" and enter a value,
- enable "Set data limit", **
- tap on "Data limit" and enter a value corresponding to your data subscription.

* If needed, you can set a warning and a data limit for each SIM card (SIM1 and SIM2).
** Data usage will not overpass this limit.