i have an issue, really need help urgently.

i recently relocated to SG and before i left from Malaysia, i ported my telco from Maxis postpaid to XOX prepaid with 2 yrs validity.

In SG, i was able to receive sms, so i thought that everything was ok. I can receive all bank TACs.

but my phone cannot receive calls. So i call up xox customer service and understand that my roaming is not active yet. but can an inactive roaming receives sms? i have been receiving smses.

so i got it activated, but people from malaysia still unable to make call to me. what else i can do?

it will be sufficient if i can receive calls, but i do not need to pick it up