Realme
Set Monthly Data Warning auf Realme
Realme phones only support one data alert per SIM, and it depends entirely on the mobile data limit being switched on. If that limit stays disabled, the alert setting has no effect no matter which value you enter.
This trips people up because Set monthly data alerts and the actual limit are two separate toggles inside the same menu. Many set the alert value first, then wonder why no notification ever appears - the limit itself was never turned on.
Where to find it
Open Settings ➔ SIM card & mobile data ➔ Data usage ➔ Mobile data limit. Turn on Set monthly data alerts, then tap Data alerts to enter your threshold. Confirm with Save.
The alert triggers as a notification once tracked usage crosses that number, based on the billing cycle you set under data usage. It does not block or slow your connection - for that you need a proper mobile data limit with auto-disable, not just the alert.
If the notification arrives late or not at all, check that background restrictions or battery optimization are not affecting the settings app, since that can delay the alert from firing on time.