pon will fail in startup but sending AT commands directly with minicom won't

I have a SIM LTE modem that use "pon" to connect. This pon use a chat script that send the AT commands needed to connect. when I try to start the ppp service, the AT commands all fail by timeout:

pi@raspberrypi:~ $ sudo pon
pppd options in effect:
debug           # (from /etc/ppp/peers/provider)
updetach                # (from /etc/ppp/peers/provider)
persist         # (from /etc/ppp/peers/provider)
dump            # (from /etc/ppp/peers/provider)
noauth          # (from /etc/ppp/peers/provider)
remotename 3gppp                # (from /etc/ppp/peers/provider)
/dev/ttyUSB3            # (from /etc/ppp/peers/provider)
115200          # (from /etc/ppp/peers/provider)
lock            # (from /etc/ppp/peers/provider)
connect chat -s -v -f /etc/chatscripts/chat-connect -T internet.x              # (from /etc/ppp/peers/provider)
disconnect chat -s -v -f /etc/chatscripts/chat-disconnect               # (from /etc/ppp/peers/provider)
nocrtscts               # (from /etc/ppp/peers/provider)
modem           # (from /etc/ppp/peers/provider)
asyncmap 0              # (from /etc/ppp/options)
lcp-echo-failure 4              # (from /etc/ppp/options)
lcp-echo-interval 30            # (from /etc/ppp/options)
hide-password           # (from /etc/ppp/peers/provider)
novj            # (from /etc/ppp/peers/provider)
novjccomp               # (from /etc/ppp/peers/provider)
ipcp-accept-local               # (from /etc/ppp/peers/provider)
ipcp-accept-remote              # (from /etc/ppp/peers/provider)
ipparam 3gppp           # (from /etc/ppp/peers/provider)
noipdefault             # (from /etc/ppp/peers/provider)
ipcp-max-failure 30             # (from /etc/ppp/peers/provider)
defaultroute            # (from /etc/ppp/peers/provider)
usepeerdns              # (from /etc/ppp/peers/provider)
noccp           # (from /etc/ppp/peers/provider)
noipx           # (from /etc/ppp/options)
abort on (BUSY)
abort on (NO CARRIER)
abort on (NO DIALTONE)
abort on (ERROR)
abort on (NO ANSWER)
timeout set to 30 seconds
send (AT^M)
expect (OK)
^M
alarm
Failed
Script chat -s -v -f /etc/chatscripts/chat-connect -T internet.x finished (pid 2017), status = 0x3

Now, If I run all the commands that are preset in the **/etc/chatscripts/chat-connect** script using minicom, the answer for those commands are instant:

pi@raspberrypi:~ $ sudo minicom -D /dev/ttyUSB3 -b 115200

Welcome to minicom 2.8

OPTIONS: I18n
Port /dev/ttyUSB3, 16:08:09

Press CTRL-A Z for help on special keys

AT

OK
ATE0

OK
AT+CPIN?

+CPIN: READY

OK
AT+CSQ

+CSQ: 16,99

OK
AT+CREG?

+CREG: 0,5

OK
AT+CGREG?

+CGREG: 0,5

OK
AT+COPS?

+COPS: 0,0,"XXX",0

OK
AT+CGDCONT=1,"IP","internet.x",,0,0

OK
ATD*99#

CONNECT 150000000

There are no delays, no waits. The OK are received instantly. Not sure what is happening. I still don't see the ppp0 connection with ifconfig tho.