Obviously, your SIM card needs to be in a device that can receive SMS. If that’s not the case, try testing your SIM by inserting it into a mobile device. How you can know if the activation succeeded? For example, you can no longer see 4G, instead you see LTE. Or perform a Speedtest and can connect to the Transatel server. In all these cases, the activation succeeded, and you no longer need to await the SMS.