Since it uses a SIM, like any other cell phone, if the SIM doesn't have balance (minutes to call), it will not be able to make calls (including the SOS feature), depending on the case it will only be able to receive calls.
Since it uses a SIM, like any other cell phone, if the SIM doesn't have balance (minutes to call), it will not be able to make calls (including the SOS feature), depending on the case it will only be able to receive calls.