In Malaysia, there is a signal and a 3g icon. Why can't I use traffic?

First of all, if you use a domestic card, you should consider whether you have opened an international roaming service. You can't use it unless you open it.

Secondly, if you use a Malaysian card, but the mobile phone is a mobile version, the network standard is different and you can't use it. Only Unicom and Telecom versions of domestic mobile phones can use 3G and 4G in Malaysia.

Please adopt it if it is useful.