[jackotman]

Hi All
here just a theory.
if i add new file in
#note that APN need to change to your ISP APN
/etc/ppp/chat-other-3g

ABORT BUSY
ABORT 'NO CARRIER'
ABORT ERROR
TIMEOUT 30
'' 'ATE1'
ok 'ATZ'
OK 'AT&F'
OK 'AT_OPSYS=1'
OK 'AT+CGDCONT=1,"IP","APN"'
SAY "Calling...\n"
TIMEOUT 120
OK "ATD*99***1#"
CONNECT \c

notes:
'' 'ATE1' Echo off
ok 'ATZ' soft reset
OK 'AT&F' load default profile
OK 'AT_OPSYS=1' only using 3G
OK 'AT+CGDCONT=1,"IP","APN"' Setup APN
SAY "Calling...\n"
TIMEOUT 120
OK "ATD*99***1#" Dual number
CONNECT \c

And modify
/etc/ppp/peers/provider

# PPP config for others
connect "/usr/sbin/chat -v -f /etc/ppp/chat-other-3g"
debug
/dev/ttyUSB1
115200
defaultroute
noipdefault
crtscts
noauth
user guest
password guest
usepeerdns
novj
nodeflate
nobsdcomp

I thought the dr800sg could using the SIM card to do the dialup.

Please let me know it is wrong.