Well, today we installed a new sim card with the old device that i personally tested for a long period of time and it went up. The device want up quickly, however, after 20m it went down till this moment, i know the device its operative and the sim card its brand new, at this point i have no idea why it keeps going down after going up ... View more

I did try that, last time i checked the inventory i though i mistaken the serial number, however it was those devices specifically that i couldn't see in the inventory  ... View more