the sim card (free) installed in the unit and AC works without any parametrage not test it in 4 g because my area is not yet equipped. wifi works perfectly against in connection with usb I had several times the message "the proxy server does not respond" and I have more internet - the solution is to disconnect the USB socket and the connection resumes in wifi. by cons I tried to make a voice call to the number of the SIM card - there is no indication to the call on the device - after ringing the phone switches to the answering machine at that time was the indication with envelope but nothing to see this message that appears on the computer in the sms nothing has to see what is this message or anything to remove it. I'm writing twice to the manufacturer to ask how to remove this envelope and there was a possibility to receive calls no response
