To set a warning and a threshold limit to control monthly data usage: - open "Settings" appĀ , - tap on "Network & Internet", - tap on "Data usage", (select a SIM card, if needed),* - enable data usage if needed, - tap on "Billing cycle", - tap on "Billing cycle" and enter a date, - enable "Set data warning", then tap on "Data warning" and enter a value, - enable "Set data limit", then tap on "Data limit" and enter a value.**