After activating the roaming service of the SIM card, turn on the Data roaming and you can use the mobile network roaming without worry in other countries.
Settings path:
realme UI 3.0 and above versions: Settings > Mobile network > select SIM card > Data roaming
realme UI 2.0 & 1.0: Settings > SIM card & mobile data > Select SIM card > Data roaming
realme UI R & Go & S & T & U Edition: Settings > Network & internet > Mobile network > Roaming
Note:
1. The SIM card needs to activate the international roaming service. Please consult the operator for the details of the roaming service.
2. The phone must support the frequency band of the foreign operator (you can log in to the realme official website to find the corresponding model Spec page to check the supported frequency band).