Should i go to Telstra?

Hello, I am originally from America and will be working at a resort/lodge to complete my 88 days, I’m super excited but saw that the only mobile/internet is Telstra next G. I currently am using a Vodafone prepaid plan and also have my American SIM card (T-Mobile, which does allow international data roaming) However would it be a good idea to go and switch my prepaid from vodafone to Telstra? I don’t want to lose my Australian number

The answer may be obvious so I’m sorry if this a silly question, I just don’t want to get there and then I have no way of contacting anyone

Edit: to specify I’ll be on Groot Eylandt