Mio A201 - Manual (Page 110)

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Make sure that the USB connection is enabled in ActiveSync on your
desktop computer. If the USB connection is already enabled, disable the
USB connection, close the Connection Settings window and then reopen
and re-enable the USB connection.
Reset your Pocket PC before connecting the cable. (See section 7.1.)
Always disconnect your Pocket PC before you restart your desktop
computer.
Connect only one Pocket PC or personal digital assistant to your desktop
computer at a time.
Modem Connection Problems
Unable to dial out
Do not install your Pocket PC in the cradle. You cannot dial out if your
Pocket PC has an active connection with your desktop computer.
Make sure that the telephone line is connected correctly.
Make sure that the telephone line is analog. Do not connect a modem to a
digital telephone line unless it is specifically designed for use with a digital
line.
Able to dial out but unable to make a proper connection
Make sure that the network you are trying to connect supports the
Point-to-Point Protocol (PPP). Your ISP or network administrator can
verify this.
Make sure that your dialing location is correct.
Make sure that the phone number you are trying to reach is correct.
Modem connection is unreliable
Make sure that the modem is installed properly.
Make sure that the telephone line is connected correctly.
Network Connection Problems
Make sure that the network card is compatible with your Pocket PC.