IMPORTANT: who used DTAC in Malaysia, for some reason the Thai SIM card is not detected at all, 2 different SIM cards in different phones, somehow it is necessary to connect roaming separately when crossing the border with Malaysia?

[Alexei]

IMPORTANT: who used DTAC in Malaysia, for some reason the Thai SIM card is not detected at all, 2 different SIM cards in different phones, somehow it is necessary to connect roaming separately when crossing the border with Malaysia?

[ᴇʟ]

On your phone, in the settings, turn on Data Roaming.

[Serjio]

More settings international roaming settings and buy a roaming package

[Volik]

Is roaming enabled in your phone settings?