bluetooth DUN for some mobiles

for some 3G phones (e.g. LG), if the bt DUN does not work, try the following initialization string:

• ATZ+CGATT=0

this will kill the current active PDP context so that the network/mobile can activate a new one for DUN. remember to cardctl eject and insert after changing the string.

to trace the ppp log, use the file /tmp/bluetooth-pppd-log