Mobile data roaming

Hello,

i’ve got a Mikrotik RB912UAG with a Huawei ME909u-521 mPCI modem attached.

ROs version is 6.18.

I there a way to enable/disable mobile data roaming? My problem is that the mobile data stop working after the country is left.

My sim card is enabled for both countries, but it only works in one.

Thanks in advance.