If you bought Reolink Go and still don't buy the SIM card, and also don't sure what kind of SIM card should be used/chosen for Reolink Go, please refer this article.
1, Please choose tested carriers/providers to buy the SIM card. Please refer here about which carriers supported in your country.
2, Select required size for the SIM card and make sure it can insert into the GO correctly.
Please note that: make sure the SIM card can work with your smartphone means the SIM card with data plan and support internet access, we mean pre-paid card.
3, The SIM card no carrier limitation.
4, The SIM card doesn't have any contract with your local carriers, we mean contract card.
5, The SIM card doesn't have device limitation, in other words, you can use it in any devices.