The device (TMAS 3G GSM MODEM) failed to function and the software provided failed to communicate with it so the factory default settings could not be changed. I failed to get any help from the firm, simply told "Sorry we do not do technical support on this product as we are just a distributor for it." Still trying to return it..... The return process demands an account number and invoice number, which as a pre-payment customer I didn't have so the alternative online form was completed but not transmitted/accepted - reason unknown. Not a happy transaction and a vast amount of time and effort spent trying to get anything out of it - but failed.