After activation, calls and SMS are usually enabled before data services. Because of this, you may temporarily see an SOS network or notice that the 3G or 4G symbol is not showing yet.
This is normal and usually resolves shortly.
What you can do
Simply turn your device off, then turn it back on. This refreshes the network connection and should restore your data service.
If the issue continues after restarting your device, contact our support team for further assistance.