Tethering: check if configManager is null

        // Check carrier config for entitlement checks

        final CarrierConfigManager configManager = (CarrierConfigManager) mContext

             .getSystemService(Context.CARRIER_CONFIG_SERVICE);

        if (configManager != null && configManager.getConfig() != null) {

            // we do have a CarrierConfigManager and it has a config.

            boolean isEntitlementCheckRequired = configManager.getConfig().getBoolean(

                    CarrierConfigManager.KEY_REQUIRE_ENTITLEMENT_CHECKS_BOOL);

            if (!isEntitlementCheckRequired) {

                return false;

            }

        }

        return (provisionApp.length == 2);

    }