Yes, exactly like that. You land for example in Dubai, go to the airport to a shop of a mobile phone operator or a shop that sells mobile phones and buy a local SIM card prepaid with data credit, present your passport and as soon as YOU have the SIM card, you can insert it into the device, and depending on which network you still have to set the APN. You get the APN settings from your foreign network operator, or it is usually written on the instructions that come with the SIM card. Then use the app from your mobile phone to log into the Netgear and enter the APN and you're done.
Already tested in France, Italy, Dubai, UAE, South Africa, etc.... tested