Hi Bernardo,
Welcome to the community!
Reach RS2 supports 2G and 3G connections, so if the SIM Card supports these connections, it should be good. Additionally, for multi-operators’ SIM cards, you may need to restrict it to 1 provider.
If I understand correctly, you are from Brazil. There will be a plan to shutting down the 2G/3G connection. As an alternative, you can use a Bluetooth connection. In iPhone, you can turn on the Bluetooth setting and connect to Reach with the Bluetooth icon, as below:
In Android, you will need to tap on the profile icon in the bottom right corner really fast, about 10 times, to activate the toggle.