This could be due to several reasons, or more: ·       The handset may be locked to another network ·       The activation process has not been sent or is ongoing (the service status of the SIM can be checked in the SIM management portal) ·       Subscribers may need to reset the network/carrier settings in their handset ·       The handset itself may be faulty (subscribers should test the SIM in a different handset) ·       The subscriber may be in an area with poor coverage