That message means that your device does not register in any mobile network.

Please check the next steps:

Surfroam SIM placed into SLOT 1
Country you are in is one of our countries of coverage
You have an unlocked GSM (2G/3G) mobile device
Turn your phone OFF and turn it back ON
Make sure your phone set to search for a network automatically
Network type set to 3G
APN set to globaldata, delete all APN records if present.
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