Last Saturday I ported my optus number to Telestra prepaid plan. I can receive and send SMS and use data. But I can not receive incoming call or make any call through telestra service.
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Well, no, they can't give you that guarantee.
If you buy a handset that does not have the capability of using the UMTS 850MHz band, then the phone won't work properly. And if it doesn't have the right LTE bands it won't work properly either.
Which model number Huawei Y9 2019 do you have? It will be something like JKM-LX1, JKM-LX2, JKM-LX3 ; JKM-AL00 or JKM-TL00